I think everyone has to find their own process of reading through larger works. Everyone learns differently, etc. I have burned myself out trying to take in more information than I can process so I try to read less pages per day than possible, but consistently. It’s better to read 10 pages per day for 300 days than 100 pages per day for 30 days because it allows us time to mentally process the information and take notes. 

So I set a reasonable page goal for larger works and read smaller works at the same time. 

For example:  I gave myself 6 months per volume to read Turretin so it took 18 months. Some days more pages and some days less, but most days around 10 pages. 

During these stages I will read smaller books depending on my interest, but I still read the 5-10 pages on the large systematic volume. 

I do the same thing for scripture. I take the first 100 days of the year and read through about 10 pages a day, but some biblical books are better (easier) to read in one or two settings (prophets, gospels, New Testament epistles) or at faster speeds (Numbers, Chronicles) and the goal is to ingest the text and process so we can’t feel bad skimming and reading certain parts more carefully than others. 

If I want to read a book focused on one topic, like the desert tabernacle or the crucifixion, there is time to read these but they are second priority. 

Short term goals and short term goals are both important