There's a difference in doing someone a small polite favor and doing unpaid labor. I definitely have previous employers to whom I'd give an hour of my time to s

There's a difference in doing someone a small polite favor and doing unpaid labor. I definitely have previous employers to whom I'd give an hour of my time to sort out a quick issue, and for a lone hour it is not worth generating an invoice and dealing with taxes. At most I might accept a meal or a pint.