Here is a chart telling you how much PL and EXP you get a minute, depending on how many people are in the chat at once. If you have weighted clothing, add in the extra amount of PL and EXP to these numbers below, and then multiply as normal.
PL a min: 200
EXP a min: 50
People: 2
PL a min: 400
EXP a min: 100
People: 3
PL a min: 600
EXP a min: 150
People: 4
PL a min: 800
EXP a min: 200
People: 5
PL a min: 1000
EXP a min: 250
People: 6
PL a min: 1200
EXP a min: 300
People: 7
PL a min: 1400
EXP a min: 350
People: 8
PL a min: 1600
EXP a min: 400
People: 9
PL a min: 1800
EXP a min: 450
People: 10
PL a min: 2000
EXP a min: 500