I'm certainly no expert in boobery anything more than a handful is a waste but even if you could keep the chafing under control with inordinate amounts of lube, I don't think their insides would enjoy being mushed around that long...
I'll be doing this for at least 5 hours, let's work hard together on this one, okay? ♥Eek...Agh.Jeez~!♥ Don't get off by yourself like that, y'hear me? ♥