Theres no clock or set time to bluff the key is bluff when you sence weakness, so you need to be looking for a read on everyone, how they play with a ok hand strong hand or chasing. Once you get some kinda read on them and what they are playing it will help you pick you spots. Also table image is big when bluffing if you have been caught bluffing a few hands then you need to play your hands cause they are looking to call you and catch you again. You also can't be afraid to bet min. bets don't work most of the time, sometimes i will donate to a min bet just for the info about what they have and it alway funny when i catch some1 bluffing and call them down and they are blown away that I called and I can just laugh cause it was like 90 chips just to get some info and next time I will use that to take a lot more from them.