Currently servers are on 24 hours,.. so when do folks play. They play whenever it is convenient to them.
If they had to play at a certain time here is the results that I see would occur.
1) Some folks a small percentage could not play for whatever reason.
2) The majority of folks (Because they are die hard fanatics) would simply explain to the wife that this screwball Skaren suggested to Dizzy that the server have hours. Now Dear I am reserving this time for my favorite game. The server would be packed with those players
The more you shrink the hours the more packed it is and the more players would have to drop.
Pushing it to the extreme,... If you had a one hour server it would be real crowded but more and more folks would not be able to make that hour.
That call, on how much to shrink it and when to run it, is best made by folks with lots O experience. If you liked the ideal.
See Tobin That's the spirit
What time zone you in, if the server went till 2 in the morning it may be the best flying time you have seen? What about weekends ? days off ? etc. Just a thought, sure not everyone will benifit from it, but most will.