For anyone who wants a somewhat accurately recorded playtime: Don't suspend and resume this game (at least on PS4). The game stupidly counts suspended time as playtime, so by just suspending for a day your recorded time will be waaaaay off.
But not only that. I wanted to fix my playtime (which sat at 1 day and then some due to the suspend/resume thing), so I loaded a save from just before I suspended the game yesterday. But hmm, it also looked off. 12-something hours instead of the 4-ish I actually played last night. Had to go back a couple of saves to get one with the correct playtime. How could that be? I hadn't suspended the game in-between those. So I experimented a bit, and it turns out that while you're in the pause menu the in-game time absolutely flies by. Like, many times faster than real-time. So leaving the game paused will also completely screw up your recorded playtime. It should obviously be the other way around, that time doesn't pass at all while the game is paused, but something is clearly wrong here. If you're in the map/inventory/etc menu (which also pauses the game) time seems to pass normally though (but doesn't stop), so that's the thing to do if you have to leave the game for a little while. Pausing is a big no-no if you want an accurate playtime by the end of it all.
I don't know, maybe most people don't care about this, but I like knowing at least approximately how much time I've invested in a massive game like this. And that feature is currently completely broken, unless you've very careful. No more suspending this game for me, and no more pausing it for longer than it takes to change whatever I need to in the menu.