Estimate the work you can see
Count chapters, topics, problem sets or other meaningful units and estimate the average time for one. Different unit types may need separate rates; reading a chapter and solving a problem set are not interchangeable.
The Study Plan Calculator adds a review allowance and spreads the resulting time across available study days. It is a schedule aid, not a recommendation for extreme or sleep-disrupting study hours.
Use feedback rather than pressure
After a few sessions, compare completed units with planned units. If the pace is slower, update the plan or scope rather than simply making every future session longer. Learning quality matters more than preserving a bad original estimate.
Breaks, sleep and other responsibilities are real constraints. The Available Time Budget Calculator can help test whether a study plan fits the time actually available.
Reserve time for retrieval and review
Finishing first exposure to material is not the same as being ready to use it. If review, practice or self-testing matters, represent that work explicitly rather than hoping it fits into leftover time.