If you take the assumption that most books average out to ~350 pages in length, then you get a pretty good heuristic that if you read a minimum of N pages per d

If you take the assumption that most books average out to ~350 pages in length, then you get a pretty good heuristic that if you read a minimum of N pages per day, then you're likely to complete at least N books per year. 10 pages per day gets you 10 books per year, 50 for 50, 100 for 100, etc. Pages read is a more useful metric in general. A process goal that leads to the outcome.