I have been wondering about character xp for a while now, and this thread seems like a good opportunity to look at it. I looked at the last 24 missions I went on (as far the match history would show me). Missions were Advanced pve, with a mix of solo/group size and wins/losses, I removed all challenge character xp from the calculation. I rounded the minutes down if under 40 seconds, or up if over 40 seconds.
Total missions: 24
Dates: From 6/30 to 7/3
Lowest xp/hour: 97.5
Highest xp/hour: 107.143
Mean xp/hour: 104.506
Median xp/hour: 105.798
There didn’t seem to be any correlation with success and higher/lower xp, nor with solo vs group, the longer missions had higher xp, but seemed to have the same xp/hour as shorter missions.
Note: As part of an earlier test I AFK’d for 20 minutes and then killed myself and got almost no xp, so I wonder if that might be a part of the variation in the xp rate.