Thats a long time.
Do you really need an external HD to use TM?
I had an initial problem with TM. While it was performing the initial backup, I began playing with Spaces. I moved the little window for TM to another Space windows, and then things went downhill real quick. Somehow the finder stopped working, and although the TM back was still running, there was no progress. I then force killed and relaunched the finder and that cleared the problem. TM then started showing progress again and finished in a fair amount of time.
I had an initial problem with TM. While it was performing the initial backup, I began playing with Spaces. I moved the little window for TM to another Space windows, and then things went downhill real quick. Somehow the finder stopped working, and although the TM back was still running, there was no progress. I then force killed and relaunched the finder and that cleared the problem. TM then started showing progress again and finished in a fair amount of time.
In the case of the intel iMac it is very slow on the Maxtor and glacial on the other drive. In an 8 hour period with screen saver off, power management set to never sleep and spotlight set to exclude the target drive it only backed up 21 GB of 238.5 GB. At that speed it should be finished about mid week. 😕
The 500 GB is a new drive that I bought for TM.