2. Judging from the loan content, it is an interest-free loan.

If there is no agreed repayment date, you can claim repayment at any time. 7 legal working days, the actual number of days will exceed 7 days. Legal working days do not include Saturdays, Sundays and legal holidays. If you think it's acceptable, there's no problem.

You are a borrower, aren't you? At the end of the IOU, add:

This iou is made in duplicate, one for each party. Have the same legal effect.

(There is no text below)

It's best to print it out, then both parties sign it and press their fingers. So you can't add handwritten content to it.

6. I hope it helps you.