good question. it could sound strange, but sometime it`s worse even a shorter session counting with clock than even longer without counting.
I will explaine : mostly in the tickling games I was taking a part, tickling was a losers penalty with some obliged tickle time in advance. they lasted short from the viewpoint of talking and long from another viewpoint - how it was in real. They lasted 2,3,5 minutes or sometimes as longer they lasted for exeample three times 3 or 5 minutes.
First, I think that the real ticklish persone ( one which cannot controle scrseamings, sounds and wild twirling and jumping ) just cannot stand more in " one breath".
It coud be longer, but than there are pauses, "empty moments", waiting for taking a breath and other.
In the counting tickling, specially with more lers, all of lers are trying to use the tickle time in the maximal possibility, that means - totally merciless and with a full power, and than, one second is realy like one minute than you are a victim.
hey I must add that I like theese questions here, they are waking some memories and pushing me to think about some new reasons and other, please, keep posting it