Hi D

Depending on the missions you are going to fly there will be some planing you have to do. (Tactics, Maps etc.) Then the mission has to be briefed, flown and afterwards debriefed.
Two of these sessions can easily take up a hole workday.
If you only fly one time there is plenty of paperwork they will let you do. (planing of upcoming exercises, flight safety, checking pubs, reading books and getting smarter) You always have to be up to speed with the newest tactics, weapons, counter measures etc. (yours and your enemies)
In the beginning you will fly a lot, but still help with the planning a lot. Later you may end up in a desk job and not fly at all. Only very few get to fly till retirement (final) in the Fighter World.