Too much context switching in a day has costs. But, not switching back to a task soon enough also has costs...you might forget certain details of the current st

Too much context switching in a day has costs. But, not switching back to a task soon enough also has costs...you might forget certain details of the current state of the project after being away for a week or two...and it takes time to refamiliarize. So I prefer 2-3 projects, spread evenly through the week, max two in the same day.