Extremely seldom in a two or three piece endgame.
Do you use analysis board?

I do not use the analysis board. Using the analysis board will not serve the goal of improving my OTB play.

When I first discovered the analysis board, my rating shot from 1300 to 1600. But after a while I noticed I was visualising moves without using the AB and the in depth analysis only comfirmed what I saw in my head. I then dispensed from using the AB altogether and did not lose any rating points because of it, quite the opposite in fact.
In esence, AB is a learning tool.

Playing otb and playing postal , or turn based chess are very different. What helps in one form of chess may be detrimental to the other form(s). What one basically has to decide is which type of chess is more important to them and make their decisions based on this. OTB play is most important to me so I try not to pick up habits from other forms of chess that will be detrimental to my otb play, thus I do not use the analysis board here. However, I DO spend sometimes a day or more on a critical move which you certainly cannot do in otb chess.
OTB play is also more important to me, but I don't see correspondence chess only as a tool for improving my OTB game. It's a different game and, when I have time, it allows me to do some much deeper analysis. I use Chessbase to keep track of my analysis, I find it works better than the analysis board and is useful to store some lines. I don't expect it will hurt my OTB play too much.

I never play OTB chess, so I'm not concerned of any effect in that regard.
I use the analysis board probably in about 2-3 moves per game, sometimes not at all, sometimes more often.
What I find far more useful is the ability to replay the game from the move list up to the current position. I use that all the time.

I have not yet played OTB other than a few friendly games many years ago. I know this is anal but I enter all my game moves in ChessBase as the game progresses so not only can I work out variations but I have my own permanent record of my games (as bad as they are) for review/replay, etc.
And no, I do not use the engine when playing.

OTC (over the counter drugs) OTB means to play NOW at the board. As for analysis, knowing certain lines of play by heart requires alot of years of play. All of us do analysis in our heads, and Anand and Kasparov speak of the "TRUTH" of certain positions, meaning that there is probably a best line at certain times in a game where you can force your opponent to move in ways that will eventually lead to your success. So analysis boarding is in our heads first of all, and a tool that we can use visually to help us master the OTB analysis when we are playing in tournaments and cannot use a visual tool except our own minds.

Agree with Dmytro.
The biggest handicap to my game is not visualization. It is use of poor chess instinct. Blunders are plenty for me. I am currently working on locking that down.
Opening the AB slows me down long enough not to make a seat of the pants move.
Maybe someday I won't need it. Someday isn't today though.
I play OTB only at work during lunch. Perhaps that will change in a while.

Always.
I have bad eyes. My peripheral vision is shot. Google pan-retinal photocoagulation. I need to go over many many lines with it just to ensure I don't hang pieces. It doesn't always work. I'm also just back after about 13 years away from OTB play. I don't have my A game back yet. I think I will start to work out lines without it though. I hope to play an OTB tournament or two this year.

I use it once in a while to see what would happen if I made a certain move and what options I would give my opponent. That's what it's there for isn't it?

Sorry, I got in on this late. Cevilchess, no question is stupid. How else would you get answers? I agree with rubycon---stupid is to not ask.
i do it helps a lot