Half an hour? Well, I can masturbate for 2 hours straight... And I dont see a problem...
Besides... Thats not a wierd fetish, thats a completly normal fetish, i just found out today that my friend has one and that he will kill me if he sees that i posted this... I have wierder fetishes I cannot speak about here, not because Im ashamed (hell no, I love my fetishes) but its because they are very, very triggering to some people... :/