How many days the average menstrual cycle lastas

A cycle is counted from the first day of 1 period to the first day of the next period. The average menstrual cycle is 28 days long. Cycles can range anywhere from 21 to 35 days in adults and from 21 to 45 days in young teens.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

It has to be b i hope this