Not voting, since the categories are bad...
My sunday game runs 1900-0030 - 3½ hours
My wed game runs 1730 or 1800 to 2130 or 2200 hours and rarely to 2400 = 3½ to 4½ hours...bimodal at 4 and 4½
Sat game runs 1730-1800 through to 2230-2400 for 4½ to 6½. But this game doesn't happen half the time.
If you average my sessions total 4 hours works since I moved south; before that, the average was 6½, not counting the half hour break for dinner, but with a multi-modal at 3 and 7 hours, which is far more representative than the 6 to 6½ mean.