The amount of time and edge will last, is totally dependent on your stropping ability, as Glenn said the time will increase as your ability improves.

It is not unusual for an edge to last a month or two for a novice. It is improper stropping that damage the edge, not regular use.

Stropping is very under rated skill. A properly stropped razor will shave for up to a year, with a pasted strop, indefinitely.
The most common problem novice stroppers have is too much pressure, an edge can be damaged with a single stroke.