I think the difference is 4 hours, so the early start at 19:30 GMT
should be 15:30 EST and 22:30 GMT should be at 18:30 EST. That's the
times when the 30 minutes practice sessions begin.
The races are meant to be around 30 mins long, without fuel stops.
That's the intention anyway and that's how we try to set up the number
of laps. But just in case, keep an eye on your fuel during a race and
if needed, use a bit less engine boost at some point. Most of the time
it won't be necessary, it's usually a problem if you do a lot of
slipstreaming or you have a few offs and spins.
I suggest you test a few pitstops to get used to it and to play around
with the pit settings in the HUD display. It can be confusing if you
haven't done it before, it certainly was for me when I began last
season in Screamers.
Cheers,
-=Hristo=-