About 3 months.
I took a very generous VR package from my employer when they relocated and the then ex-wife was between jobs. Decided to throw a few shekels at hang all expenses AONE4 trip. We were in our mid 20s and barring some huge windfall thought we wouldn't get the chance to do a similar length trip until retirement. Mostly 3-5 night city breaks but with about 7 days and 10 days in Alaska and south island of New Zealand.