rickair7777

That depends entirely on what your civilian career is. Airlines? Won't hurt one bit.

Corporate America? Won't kill you, but it will dampen your promotion opportunities some because they know you will be gone at possible inconvenient times.

Academia? Would probably not hurt you, since you could focus your annual training during the summer break.

Note that you never have to use vacation for reserve duty. You do as much reserves as you want/need to and legally they cannot hold it against you.

For a reserve flying job, you probably need at least 4+ days/month but they don't necessarily have to be all in a row. For a non-flying job 2 days might be OK.

It is usually initial training, life is much better after that. But deployments to the middle east might not be a load of fun either.

If there is an opening in a squadron that flies the airplane you are trained on, not too hard usually. But odds are you would have to travel some distance or get retrained on a new airplane (time consuming, and the unit may or may not be willing to pay for it).

Actual legal minimum for all federal branches is 2 days/month and two weeks (12 day) per year. But most military reserves (flying or otherwise) do more than that. If you don't drill enough you will not get promoted and could get asked to leave. Note that the military has an up-or-out promotion system...generally if you do not make O-4 (Major / Lieutenant Commander) you will not be allowed to stay long enough to earn the retirement.