Tumble drying, just like any normal use, contributes to wear and tear on fabrics and seams. If it takes 45 minutes to get a load of laundry dry with heat, but t

Tumble drying, just like any normal use, contributes to wear and tear on fabrics and seams. If it takes 45 minutes to get a load of laundry dry with heat, but three hours to get it dry without heat, the wear from tumbling would occur four times as quickly. Heat may confound this, suggesting an equilibrium that minimizes both wear from excessive heat and from excessive tumbling.