In your opinions how far would you feel is too far to travel from ceremony to reception site?
I think a good max would be an hour. I've had to go a bit longer than an hour between each location and after that point, it was a bit frustrating.
30-45mins is probably the average I've traveled between the two sites, and I didn't hear any complains for that.
At the end of the day though, you know your guests best. Ask a few family members how they would feel and use that as a starting point!
It's been so long since I've been at a wedding, but I would agree with everyone else. Definitely less than an hour.
Ditto for me too - about an hour would be optimal. We did have a family wedding to go to, but we were there for the weekend. Local, definitely an hour. : )