45/45. And you probably won't find many/any opponents other than the computers at that format. You can however play custom challenges, rate or unrated, against the various computer levels.
Do Live Chess -> Computer, select the computer, and it will come up with a dialog to create the challenge.
I am playing a bunch of 4-5 10 min games a day, but definitelly not for me, as I play like level 0 stupidity, and obviously I get too superficial thinking.
I need more time to think, make plans and not offering free pieces to my opponent. I am going to play now 15 minutes, but do you think it's still too short to really learn? The thing is I don' have so much time to dedicate on chess ( cause kids, work, other things normal humans do)
Which best format would you suggest to capitalize my time best?
So in other terms, one single 30 min game a day, or two 15 minutes games, to learn more efficiently?
Note : I always start by a session of all tactic exercises my current account allows me.
Thanks for your suggestions/ advices.