It' simple to work out that it dosn't take5 mins to reboot a computer for a start.
This is a huge minority compared to the majority of disconnections from someone playing a bad hole and just leaving.
The problem is 5 min is just way too long. 1 min to 90 seconds is more than enough.
10 times I have sat there now afteromeone has disconnected and zero have returned so your theory of the 5 mins for the rebooter is simply blown out of the water.