---ini-enunciat

>>> from tasques2 import encavallament
>>> from datetime import time

>>> encavallament(time(10, 00), time(12, 00), time(11, 00), time(14, 00))
datetime.timedelta(seconds=3600)
>>> encavallament(time(10, 00), time(12, 30), time(17, 45), time(20, 00))
datetime.timedelta(0)

---fi-enunciat

>>> encavallament(time(16, 00), time(18, 00), time(15, 20), time(20, 50))
datetime.timedelta(seconds=7200)
>>> encavallament(time(16, 00), time(18, 45), time(14, 00), time(16, 00))
datetime.timedelta(0)