I went for about 3-4 days of no masturbation before the last time I had sex. It made first contact a little sweeter. Not sure about what a reasonable time would be. The longest I went, that I remember, was about 3 weeks while my (soon to be ex) wife was recovering from surgery and couldn't have sex. I didn't masturbate in that time period either.

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these