How many engagements is too many engagements?

When I saw that Bennifer is engaged - again - it got me thinking... how many engagements would I consider too many in dating a person? At what point would I think the person is just a serial engager, putting a ring on the finger of anyone who will say yes? I'm thinking 2 engagements is the max I could handle. Or 1 engagement and 1 divorce.

What are your thoughts?