About 150 hours total. This was mostly done in 2-3 weeks before the test. I think quality, not quantity matters.
Hi Colleagues,
I put in preparations something like 600-650 hours 
. I was studying mainly with CFAI books and got >70% in all sections :).
Hi heyjude,
I comitted 600-odd hours as well - and it paid off 
A lot of hours.
Between 300 and 350 hours. I could have passed with much less but it never hurts to over study.
I am about the same. I think maybe 130 hours at most. I would not recomend that, and I will not be doing that for level II.
I didn’t track it, but I put anywhere between 200-240 hours. Mainly condensed into 2 months, with majority of it in the last 3 weeks. I passed Lvl 1 but likely only marginally. Its taught me a lot about the process to prepare properly in Lvl 2 without stressing myself out.