eeach trade takes about 45 secs. You have 129 pokemon. PLUS you are trading them back... prob. 129x45=5805 sec being about an hour and 6 min. to trade them all back is double, making 2 hours and twelve min...
im trading them back yes, but i dont need my pokemon returned to me. so its a continuous new pokemon that is traded to me. either way, thats not long in my opinion