My 2 cents is 45 to 60 secs, most of the reason you need the time is to read the high winds and or putts. Although I find most 30 sec people are thinking they have leveled the playing field by using that option. I will play a MP or even a AS with a 30 sec clock never a ranked game because its quit tough lol.
Give me a 60 sec clock and I am happy all the time but like most play mostly with buds and a 90 sec clock, which is never needed.
Mes.