For me: 2 days.
I received a new Mac mini on Friday and have been using Lion with the reverse scrolling since. At the same time I installed Scroll Reverser on my Snow Leopard machine so it's the same there.
At first I mistakenly moved my fingers down to scroll down when I switched to e.g. the browser and quickly wanted to scroll somewhere. Muscle memory. But I just kept reminding myself: where do you want the content to you?
Now, two days later, it feels completely natural and I never mistakenly scroll the wrong way anymore.
Loving it
I received a new Mac mini on Friday and have been using Lion with the reverse scrolling since. At the same time I installed Scroll Reverser on my Snow Leopard machine so it's the same there.
At first I mistakenly moved my fingers down to scroll down when I switched to e.g. the browser and quickly wanted to scroll somewhere. Muscle memory. But I just kept reminding myself: where do you want the content to you?
Now, two days later, it feels completely natural and I never mistakenly scroll the wrong way anymore.
Loving it