The weather/performance and airspace identification are typically the more lengthy material to go through. The 107 regulations themselves are straight forward like; keep it under 100mph, stay below 400ft AGL, fly within visual line of sight. Devoting a few hours per day for a month is an average time to review 107 material. You could move faster, or take some more time. Estimating 2 hours per day for 20-25 days, 40-50 hours.