Just to check maid off days is from what time to what time?

There is no specified time, but I would think a safe guideline to follow is the typical office hour work day - i.e. 9am to 6pm. You could discuss with her to see which timing she prefers. http://www.mom.gov.sg/passes-and-permits/work-permit-for-foreign-domestic-worker/employers-guide/rest-days-and-well-being