I have a very hard time believing that anyone is actually wanting this with any seriousness. I have a few clients who are really "into" ball busting and it's a small buildup and than wham wham wham.
The most that I've done is fifteen times and many of those weren't strong punches.
So I wish for you good luck. Honestly, five hours of ballbusting? I don't believe that it's possible unless he wants five hours of soft and medium types of hurt.
Then, it would be the same as keeping a man on the edge of orgasm for several hours. I actually find that most men cannot take that teasing, and few then, for more than a couple of hours before begging for release.
Three hours a few times.
From an escort's perspective, and not a mods, sometimes when guys are asking for this, they're wanting phone sex and to imagine it. I cannot fathom this guy really wanting this, although I'll admit to hearing worse.
But if he does? PLEASE come back and tell us EVERYTHING! Or send me a PM!!!
Good luck,
Elisabeth