On Thursday, April 20, 2017 at 1:56:18 PM UTC-4, Micky wrote:


But I wonder if 40 or 50 minutes or 2 hours of tumbling will have a
greater wear factor on the shirts than 20 minutes, or haning on the
line. ???


Try this experiment:

1 - Sit in a chair for 6 hours.
2 - Roll down a hill for 20 minutes
3 - Roll down a hill for 40 or 50 minutes
4 - Roll down a hill for 2 hours

Which one of those steps wore you out more?