I only started running seriously in Feb/Mar this year and didn't join a club until May, so a 1.5hr run is still long for me.
I go out for a long run on Sunday, normally with my club. Usually, it's the good runners in my club (sub-3hr marathon in some cases) on the Sunday run. Their slow pace is close to my running pace. Recently, I did a 10-miler (completed it in 1hr 23mins), and its the longest distance I've ever run.