Starting with a freshly honed razor, the usual protocol is to use a plain strop until it no longer brings the edge back. Then you use a pasted strop to refresh the edge and continue using the plain strop. When that no longer works, you hone the razor with 1-4-8k stones. Like others have said, a razor can last quite awhile on just plain leather.

There is some debate on using a very fine, mild abrasive on your daily strop. There is a thread about it you might want to read. I've used graphite and .05m allumina polish before; now I'm back to plain leather. I can't decide which I like best.