I play a lot of hours, being retired and such. One way I keep the game interesting is I break it up a bit. I found if I just fly all the time I get bored, so when that happens I start GVing. When I get bored with the flying and GVing, I then start bombing. By that time I'm ready to fly again. Some tours I fly more, some I GV more. There is no rhyme or reason for which one I do except for what I feel like doing at that specific time. So far it has worked.
Just my OPINION
Fred