Can I do History 3 days a week?

We are mostly on a 4-day week for academic subjects, except for math (5 days).  We do Bible separately, assigning specific readings and studies to the individual for the most part, and we count in family devotions.

We have done history/geography over 4 days often.  We just do history on 3 days and geography on the 4th day.  Sometimes, if we need to intensify a portion of history to finish in time (or to prepare for an upcoming field trip), we will add in another day, but mostly history is 3 days a week.

That being said, if we should have done 30-minute readings with or without narration over 4 days, I added on 10 minutes to each of the 3-day sessions so we covered what we needed.  However, my kids have all been middle school or high school ages in the past 3 years, so that was not too much.  If you have younger kids and only do 20 minutes per session, you might want to do 30 minutes per day split up a bit if that’s too much in one sitting.  Then geography would have its own separate day.