Find someone who hasnet done his critical missions ( ex: Meet Org Leaders ).
Then find a " sweet spot building " ( there are several )
Have the person start the mission ( to meet the leader ) and then have them leave the group.
The rest of the group will still have the mission and will meet the leader ( which takes like 10 - 20 seconds, depending how far in the floor plan the leader character is ).
once you meet the leader you have finished that objective and just run back to the elevator. You get 160k info and around 130xp, plus some nice mission loot given to you bye the the leader ( like buffed shot gun etc etc ).
Reinvite the person that has the critical mission and have them call the critical mission again and then boot him & rinse and repeat.
The person who starts the mission and gets booted will not get xp or info. But its only fair to pay him a share of your profits.
Now for the MATH:
160k info every 20 seconds = 480k info per minute
480k x 60 minutes = 28.8 million info per hour
28.8 million x 5 players = 144 million info per group per hour.
130k xp every 20 seconds = 390k xp per minute
390k xp x 60 minutes = 23.4 million xp per hour