How much play time can I get?
First time playing, no strategy guide, and just a few side quests if any.

Alot, 50ish if you dont try to level up or get max social links.

Nice.
50 hours for 40 dollars.
I'd say I got my money's worth.

If you actually play the game for all it has you can easily get 70+. And doing everything is so fun, you won't even notice. Though dungeon crawling does get monotonous after you've finsihed all the quests and are just leveling and getting money for the next part of the dungeon to open.

I'm at 90 hours and I havn't beaten it yet.... of course, I've spent an absolutely pathetic amount of time in tartarus....

I did finish my first play with 120+ hours, but i did max all s.links, spend a good amount of time perfecting the persona fusions specially the one for Thanatos...