What TC do you use for OTB non-tournament?

I like to play G/60 or G45. Please tell me how you get used to sitting for hours in the tournament.

"Play longer practice games" seems the obvious answer.

Have you never played chess for hours?  You can do this with blitz games too.  Or do you mean how do you effectively use the extra time at tournaments?

Wafflemaster,

I play Chess for 4-6 hours every single day. I play blitz seldom. I'm 54 and like to play very slow. Example: Today, like most every day, I got up at 7:00AM and played til 9:30AM. Before the rest of this day is through, I will play at least 3 more hours.

I almost never play OTB non-tournament except for blitz games between rounds at OTB tournaments. So usually 5 0 or 3 2. 

Online I tend to ike 15 0 and 30 30 over blitz.  

I see.  Well my answer is the same as Estragon's.  Very few people sit at the board the entire game.  Get up and do a lap around the room now and then to stay fresh.  Go get a refill of water/coffee, check out the standings/pairing sheet, etc.