Aggregating Vs week in graphs in order evaluate volume

Which of the following is easier to understand the volume?

I'm looking for a congitive research which supports my assumptions that aggregation. Update - Assume we are talking on the number of hours and each bar represents a shift in a day. Red means more than 100% required hours per day, Grey means about 80% of hours per day, Etc.... White means no shift on that day.

is easier than dispersed