It is not on patreon for 9 years, something like 6 I believe where he actually was having some support from it.
If we are gonna count from the moment devs started their pitch and first demo for game many games would count over decade. Then there are plenty of porn games that predate this forum and are still in development and those are just RPGM games. The other UE projects also appear to be in limbo with no ending in sight.
At some point we just get used to it and really the question becomes do I get few faps for my money rather than "am I helping a good project come to fruition".
The game launched on Patreon in 2016, literally the instant they allowed adult content, so that would be seven years.
But PHplusSTUDIO started in 2014 when Epic brought in the new licensing terms for UE4, Daisy in Summer (the initial prototype) was released in 2015 and
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seems to suggest that users were
already concerned regarding the slow development:
I believe that many players, not just gentleman players, are very concerned about the R18 game "PROJECT H" created by the Chinese using the Unreal 4 engine. The development progress of the game has become the object of concern to many people.
(...)
According to PHplusSTUDIO, the development team of "PROJECT H", the level design of the game has been completed and the scene construction has begun.
You can quibble over when to start counting from but given the current state of the project 7-9 years of dev time is pretty shocking even if you're willing to pretend dev didn't start until 2016.
There are also a lot of other projects like this* but I don't think that's overly relevant, I wouldn't recommend supporting those either. I think ultimately the answer to your last question is invariably going to be that, no, you aren't going to get any meaningful content for $36. You're going to get an indefinitely half baked animation viewer that makes you grind out daily quests to unlock content you paid for and will very likely stop working in a few years when it's truly abandoned.
*Although I would stipulate with this that I'm not aware of any other titles that have been going for this long with this little to show for it. Even titles like Wild Life have a rather extensive set of models, animations, tooling, gameplay systems etc.