And one last note gleaned from a contest flying camp. *Instead of
adding
a 10 minute buffer, just estimate 2 miles per minute (120mph) for
final
glide. *You're not likely to fly that fast, especially in sports class
or
on a dry day in FAI classes, so you won't come in under time. *E.g.,
you're 20 miles out, so figure 10 minutes. *If you're 15 minutes under
time,
then you should fly further and find more lift.

-- Matt


Put another way - you should add 10 minutes on top of the 2 minutes
per mile, not instead of it. For very long final legs add a bit more
than 10 minutes.

Andy