Could not help it

Hi, was looking for something bigger to ease me horny and think now that

I went to big. It is a 3" girth and 10" long

Have been only able to fit the head in with all the lube use. How long do you think it is too long to masturbate it felt so good that I almost spend the whole night with that inside. If using a vibrator how long is too to keep it inserted, because sometime I can have it on for hours.