Mine used to be about a minute, and now it is 20 seconds. I use this to tell the captains my personal style as I feel it is absolutely relevant and they need to know it, i.e. -
1) I just want to watch you boys play football, I like to let the game flow and I will come back for fouls if I need to so make sure your boys play to the whistle
2) If you want a chat about something, do it at the right time and not from 50 yards away. I don't mind chatting, but keep it nice and keep your boys under control before I need to.
3) If I call you over, it's a final warning for your player so support me and we'll keep the cards in my pocket.
I also make sure I give the club linos (where I have them) my instructions in front of the captains - specifically that I cannot take fouls from them and there only job is to indicate ball in/out play and offsides. If I don't agree with their offside flag, we'll play on.
Toss - I do it and the away side calls.
Nice and simple, no surprises.
... go on - live dangerously - let the CAR signal for fouls too