I didn't have that one in either of my logs (I only have 2 computers), but a minute and 40 seconds doesn't sound unreasonable at all.
The two I have folding presently are:
P1156... @ 5 minutes, 6 seconds
P756.... @ 26 minutes, 50 seconds.
(both machines are AXP 2500+ Bartons @ 2150MHz (or 2800+))
Don't know if that helps you much... maybe someone else has one going and can compare with you.
srry
-Sid