I don't think it's very difficult. Once you get everything up and running, I'd say you invest at most half an hour per week. The initial setup is a bit labor intensive, but afterwards it's just a matter of harvesting your cultures about every 5-7 days, cleaning your culture containers and adding new water and F/2. This literally takes me 10 minutes or less. If you use plastic bags for your cultures like Mr James did in the link I provided, that eliminates cleaning new culture vessels, making the process even that much easier. You'll also end up making far more than you need, so you may be able to make a few extra bucks selling it to fellow reefers or fish stores.