Hi Mike87
If they haven't changed from the published scheme shown on their w/site & the normal procedures of previous years, the first sortie is around 0830, about 30mins flying and then others go for the second, etc. Generally five sorties a day, each weekday.
No guarantee of course. If you are a FaceTwit, you would get better updates than me who relies upon the w/site. It will be slightly awkward for you having to book time off and then the weather closes in.
Best of luck, well worth the risk if the weather is good. I've had several years of excellent flying from them at this time of the year.
Hope this helps
