It just so depends on how familiar you are with the opening to start. Something you've never seen or played before might take a day's research before you're comfortable choosing a plan. Stuff you know can be blitzed out. How many games do you have going? I played a guy a month ago who was comfortably playing 200, although to tell the truth he was kind of "sandbagging" since he had a 10% timeout ratio and his real rating was therefore higher.
Depends on how competitive you are as well. I used to "sweat blood" over every move when I first joined. I'd spend 2 or 3 hours over anything that wasn't crystal clear. NM awrats (I'm probably misspelling his handle, sorry) has built a whole teaching system based on just that approach. He credits his rise to becoming a titled player to sweating every move in correspondence chess. I found it was driving me a little crazy so I stopped doing it. Of course maybe becoming obsessed with the game is the quickest and surest way to become good. I don't, and apparently never will, know.
I keep telling myself to slow down now and at least sleep on every move in a 3 day move game but it basically never happens. I know that when you find a good move you should always look for something better, but I'm usually just so happy to have found a good move that I play it. Lowering expectations and aspiring to a fine level of mediocrity has its' own rewards. No more of that waking up in the middle of the night with an idea for a line and rushing to a bank of chessboards to try it out. Of course as I look around the apartment I do see 4 chessboards set up with positions so maybe I'm just trying to kid myself. Back on topic, I do find some guys who play 3 day chess as though it's illegal to move before the third day, but most seem to take less than a day.
my turn-based is ~1650, blitz 1150!... i guess that says (beside that i'm a terrible chess player) i'm thinking too much my moves when i play turn-based games? 1 to 5 minutes here... (unless i have a forced move or a simple position)