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Used an HP Pavilon for 3 years. It was a rough time, but there was no money to upgrade. Since then I've been able to upgrade about every year with about no expense by selling the older computer. Right now I'm on a macbook and finally have found a computer I'm comfortable with. Until there is a feature I absolutely need, there is no need to upgrade any time soon.
 
I bought a Tangent 486 EISA, with a SCSI 386SX Caching Controller (4MB)when the chip first came out. I guess that was around 90-91? It had 8, 4MB SIMM slots, and housed 6 SCSI drives. I continually upgraded that machine until it was absolutely maxed out. I worked in databases, and the EISA SCSI controller allowed this machine to dominate everything, until the PII's came out. So, I suppose I got 5-6 years out of it. I did buy a Sun Sparc 10 WS during this time, but I do not think that should be counted.
 
03-04... 17" 1GHz Powerbook (stolen)

I had a 1.5ghz PowerBook G4 17" that was stolen from my house during a party (it was supplying music and visuals to a projector screen).

That lasted me from about November 2004 until April 2005-ish.
 
Roughly 4 years ago I got a 1st gen 17" PB... recently the logic board died so any day now I'll be updating.
 
79-83 Apple ][+ (School labs)
83-84 Apple //e
84-86 Macs (School labs)
86-88 Commodore 128D
88-95 Tandy PC clone (DOS)
94-96 '286 notebook (DOS/Windows 3.0).
96-98 Pentium 150 * ('95)
99-02 Celeron 433 * (2K)
99-05 Toshiba Celeon notebook ('98/ME/XP)
00-03 Pentium III 750 * (2K)
03- Dell Dimension 4600 P4 2.8 GHz (XP)
05- iBook G4 notebook 1.33 GHz
06- iMac Core Duo 17"

* Really a continuum of DIY machines upgraded bit by bit 3 mobos and a variety of CPUs, etc...

I'm a bit surprised looking at that, but the DOS :eek: box I had all through graduate school is the winner. Of course I had plenty of other boxes to work with at school/work at the same time, but it was still 7 years.
 
4 years, twice. once from 1991 to 1995, going from a classic ii to a quadra 660 and again from 1997 to 2001, going from some performa to a dual usb ibook g3. since then, i've changed computers every other year or so.
 
1987-1992 noname 286
1992-1995 noname 386
1995-2000 noname 486
1997-2002 noname Pentium 233
2000-2007 Gateway laptop (gave it away last week)
2000- HP PIII laptop
2000- noname PII tower
2003- noname P4 tower
2003- Toshiba Tecra Centrino
2004- PB 17"
2006- iMac CD

So we now run a mixed Win/Mac household and I travel with the PB I have had since 2004. This is the longest I have kept a given laptop as my "front line" computer and I plan to use it as such for at least another year. All going well I will buy the kids a Mini later this year, and a MB early next year (although daughter's school requires that we buy a Thinkpad through them if we want her to have access to their network ... a "discussion" to be had when I get back to Australia!)
 
July 1993 I bought a Centris 610, which I upgraded from 4MB of RAM to 8MB and then 24MB. I added a second hard drive, bringing the total from 80MB to 120MB. I also added a 28.8 modem around December 1996.

This was my only computer until around December 1998, when I bought a 233Mhz iMac.

So, 5.5 years.

My iBook bought in July 2001 also lasted until around November 2005 before the backlight for the screen died. I still fire it up once in a great while.

I'm hoping my October 2003 eMac lasts until 2008.
 
For Me:
iMac, 8/98
TiBook, 12/02
MBP 17", 6/06

Little Brother:
iBook, 2/00
AlBook, 04

He is next in line for an update, MBP 17" at 8/08. Would be sooner but he doing summer school so he not going to get his MBP 17" til is finshes it.
 
Bought a Mac Plus in 1991. Still have it.
Did not get a new personal computer until 2000 when I got a NEC POS.
Then I came back to the fold with my iMac G3 that I got in 2003, still have that and use it every day.

So I guess 9 years, but I have had work computers all along that kept getting faster.

I have a core2duo 2ghz with 1GB of RAM, 15.4" laptop. Nice. I just wish it was a MBP. :(
 
Bought a Pismo 500Mhz in Feb. '00 and gave it to my son (still going strong) when I bought an AlPB 15" 1.5Ghz in Oct. '04 = 4.7 years.
 
Went from 96 to 02 with only adding a 2nd chip to get to dual 1ghz P3. (now its a server)

Now 02-07 with P4 2.4ghz.

Did buy a laptop a few years ago but it was an addition and not a replacement.
 
A Compaq Presario running Windosw 95, which I used from '96 to 2002. Then I got a P4 Dell (Which I still use, albeit with Ubuntu), then my MacBook in July. I also have a Rev. A eMac that I bought used a few months ago.
 
6 years on a blue & white G3 tower. Best computer I've ever owned -- never a problem, worked as well after 6 years as the day I bought it.

Sold it after 6 years, and I bet the thing still runs like new with the new owner. What a workhorse.
 
Sept. 1995 - PowerMac 7500/100 (Upgraded with Sonnet G3 card at some point)
July. 1998 - PowerBook G3 233MHz
Jan. 2000 - iMac 350MHz
Sept. 2001 - PowerMac G4 733MHz
Oct. 2005 - PowerBook G4 15" 1.5GHz


So that's 4 years and 1 month between the PowerMac and the PowerBook G4s.
 
I used a WIN 98 PB (no not Powerbook, Packard Bell...:rolleyes: ) for about 4 years after windows xp came out :D

And my sister still has a WHITE Dell Optiplex with it's 10 gb hard drive and 128 mb ram....peh :p
 
I think my current machine has been in my hands the longest...since October 2002. My sister still uses my old G3 as her main machine and the old 7500 my Dad used until he got a mini last year.
 
1987-1993 Spectravideo 738 - Xpress (even used it for IRC)
1993-1998 Pomi 486DX2/66 (upgraded later to 486DX4/100)
1998->present day Many, many Macs. Starting with iMac 233MHz to the current iMac CD and MacBook CD.

I've promised my girlfriend not to upgrade my computers at all this year.

The. Dumbest. Promise. Ever.
 
5 years for an imac G3.
I think that i will start upgading more often now as i can now spend my money and can sell my old computers for the price that i bought it so tis all good and i get my money back.
 
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