Our DD did online school, and it was as aeh suggested - she sat at a desk in her bedroom to attend lessons, with the door closed to eliminate background noise. She did her assigned work at the same desk.

Given that she could work at her own pace, it didn't take up an outrageous amount of her day, so there was a lot more free time than she'd have had in school. Her mother was also a first stop for any questions, who was also expected to be a sort of facilitator between DD and the school.

Bottom line, her mom found a lot of time for other things through the day, less so than when DD attended a brick-and-mortar. But being there for our kids is part of the responsibility we assume when we create them.