Yeah I've noticed many people seem to think the perfect length for a marathon is however long it takes for them to get bored. Even ran into people who purposely block teammates from disarming a beacon to force their team to lose.
For the voting system, I don't think kicking a player and vote map end should require the same amount of votes. Also, 30 seconds is way too long, 15 seconds is more ideal. (Old system was ~7 seconds I believe)