Did some math with my playtimes on steam. Note that I consider 'playing with friends' to be friends I've met outside the game, with intent of playing with those people and not just happening to be in the same place (e.g. blockland)
Friends: 1835.97
Without: 2724.53
Pretty good mix tbh.
Though if we include non steam times holy stuff friends would probably be pretty close because of all the stuffty MMOs we've played.