Leaving earlier than agreed can be very harmful for your host. He is counting on your help for the period confirmed on Worldpackers. So, if you leave, you'll let him down. It’s very important for both of you to commit to what was agreed. Our community depends on commitment and collaboration on both sides.
If you really can’t stay for as long as agreed, talk directly to your host, explain the situation and take his opinion into consideration.
Never leave your host’s place without explaining why! You wouldn’t like the host to send you away out of the blue. So, be understanding and responsible!