I think 5 minute's is long enough, many games have an "I am ready button" that you can use but even then it is down to every player being ready, and clicking on it.
I don't mind waiting 5 minutes, on-line, even though I am ready to carry on playing right through, it is not a lifetime to wait, but not everyone is the same, some may need the Bathroom, or a Coffee/Tea break, some might even want a sandwich, but it does not take 10 minutes to throw a slice of Ham and Cheese, in between 2 slices of Bread. I know because I have done it many times.
You have to take into account that for the
poker sites, Time is money and the more games they get through, the more they make, so be grateful for the 5 minute break, I don't think they would be pleased at giving you any longer.
When the fun Stops, STOP!
(take a break)