I think only 500 hours/year in some cases, but even the full 1225 is doable with the 4 months on 8 months off schedule.
But yeah, get them through one of the subsidy offices. It'll cost you 700 to 1200 Euros but increases the chances you'll get it and is definitely worth offloading the administrative hassle.
There's plenty of info one Google search away, but easiest is probably to just ask one of the providers that will handle the registration for you.
I use subsidiefocus.nl, but feel free to shop around. Just keep in mind that there are sharks out there that will get you to pay E2000/yr and bind you for multi-year contracts; so shop around and be wary of AdWords advertisers.
Oh yeah; also make sure you inquire about the RDA subsidy which is not that big, but is often available on top of the WBSO subsidy.
But yeah, get them through one of the subsidy offices. It'll cost you 700 to 1200 Euros but increases the chances you'll get it and is definitely worth offloading the administrative hassle.