Does anyone else feel a 5 day free agent period is too much?

I don't really mind it, though I'd also be ok if it was a day less. I don't think I'd be in favour of any less than that.

some human run leagues have 3 which is too short. I would be in favor of 4

In agreement here. 4 days would be optimal.

I disagree. 5 days is good. If you lose a player you were bidding on it gives you a chance to feel holes before the draft. Also KC won free agency this year.