No, two periods is 10 days. The incubation period is 2-14 days but the average is 4.6-5 days. You use the average for using r0 and waves.
I am using the length of the longest determined incubation period for Covid-19 as the baseline. The standard that two incubation periods must pass before a disease is considered eradicated is based on the longest known incubation period, not the average. This is the standard that is used to determine whether an Ebola or Marburg outbreak is finished.