All the IOE lines in my class were 3x 3 day trips or 2x 4 day trips or thereabouts, yielding about 40 hours total. Some guys wanted to be signed off before their trips were done right at 25 hours. I requested more IOE since mine were mostly Phoenix based and I wanted to stay on the west coast and delay shtty IAD as long as possible, but they would only let me do what my IOE schedule had. I've heard of people needing and getting more some how though.