How to Optimize My Deep Work Time During a Pandemic?

Teaching faculty at a top university, currently working from home due to the pandemic. Risolus focus on reducing the exhaustion on the hard days. How to compensate for some exhaustion or draining. And still get good stuff done. I cawl, this is laura. My issue is that i am currently teaching quite long days onmy mondays, wednesdays and thursdays. But with the twelve hour days, i teach first thing in the morning at eight a m,. Then i teach again at six p m, until seven thirty p m. The effect of it though, those two teaching days a week, are killer because it's non stop.