Your time spent memorizing can be made more productive through three simple activities.
First, take small bites. The human brain remembers about 11-12 words before it starts to let go of an idea. Musically speaking, that could be as much as a measure or as little as a single chord. In fact, it is conceivable that several minutes might be spent recalling repeatedly a single note. Look at the page. Then, without looking at the page, imagine yourself playing the selected notes. It may take several repetitions of looking and not looking before you get all the notes right. When you can imagine...