I mean IMO you can't say that you bluff 1 time for every hour because if you hit the guy who's TAG you'll have problems. I think you can't have bluff frequency , you can bluff when situation is good to bluff.
I'm only bluffing when I'm pretty sure what opponent is holding and I know that there's big percentage that he'll fold to me.
Will not believe that there is an exact frequency ...
bluff is a strategic tool or despair ...
in a situation of much advantage or all or nothing ....
but in any situation always has conviction ...
convince the opponent that you this in the advantage ....
not too bluff the opponent can notice and take down
It depends which cards are on the board, which position you are playing, how many people are playing the hand and how much you bet for the bluff. All this information is essential to the decision whether you should bluff or not.