Use the Hourly Attendance page: Entering hourly attendance outside of scheduled class dates
Select Attendance Type = Independent Study
Pick a week from the calendar dropdown.
Enter up to three (3) hours per day for each of the five days.
Save the time.
OR, do it by student. Click the icon next to each student's name and enter hours over a wider range for that student than just one week. Be sure you select the proper attendance type.