I don't know why people reply in terms of months. You're not playing every second of every month, it's more accurate and useful to answer in terms of hours. Took me about 70 hours of play to get 1000pp.
I was inactive for a long time until I started playing again but went inactive again. I got a tablet about 5 or 6 days ago so I started playing again but including inactive time about 9 months.
Once I decide to actually hit 3k pp it would have been around 9-10 months time. Which I should have hit earlier but I've been slacking on farming and just having fun
Multiple years now and I haven't yet achieved 1000pp (I don't care about my rank and I don't farm pp). I have achieved 500pp this month as a result of FCing some Insane diff for an 81pp play.
I guess around 2 weeks or so. I just came back during that time at around 300pp and I kept playing until I realized I was just racking up pp for just playing songs I want to play.