Check Engine Light, loose gas gap 2001 Avalon how long to reset?

I am aware that a loose gas cap can cause the check engine light to
turn on.[color=blue]
>From what I have read, once this is corrected it will go off in a[/color]
while, maybe
a week. Is this based on time or miles driven? We probably do not put
more
than 20-30 miles a week on the car, so does this mean we should wait a
month
for it to shut off?

Its based on how many drive cycles are completed with the evap monitor
running as it should. So in your case, it may take a while, particularly
if you are in a cold climate. If you go to the fuse box under the hood and
pull the EFI fuse for a minute or so it will clear any codes stored in the
system.

Thanks, I will give it a go.