Talk:Alliance Ultimate Battle/@comment-3204627-20150830143716/@comment-26896603-20150830145539

" battle points are auto recovered at a rate of 1 every 5 minutes"

You can use the AUB timer as your reference for 1st BP regen or you could go to Battle > AUB  to see the time left until full BP recovery.

" Combos will expire after about 10 minutes if no one in the alliance attacks."

This should answer the other question.