I disagree with Commanderski here. Yes, the game is very detailed. And if you want to be very 'down in the weeds' the game allows that in spades. But it is also very fun, I would say more fun, to play by mostly just pushing counters and looking at the high level action. The game takes care of all the details for the most part. Now if you are playing competatively, yes it would be a disadvantage, although honestly probably not such a huge one. But you can do gross adjustments quite quickly. For example, when playing soviet, I like to control my flow of replacements in the early stage of the war (when I am watching Arm pts) to the most effective units. So I turn them all off in the beginning, and each turn do a sort on the commanders screen of inf. units by experience or morale and turn on those units that are at whatever level I want. That whole process takes me maybe 5 minutes... that is an example of something where you could put more time into it, but there is very serious diminishing returns I believe.
Now some things like the first German turn, yeah they take a while. But the first several for the soviets are fast!
I play hotseat now more than PBEM and it is a great game for it.