How do you know if you're doing enough to pay off the 5 debts?

For example, for Nri Rina (Debt to Humanity), is volunteering at the local food bank a few times in your lifetime enough? Or does it have to be a weekly thing?

And for Rishi Rina (Debt to the Sages), how much do you have to teach to fulfill the teaching requirement? Is it sufficient to teach one person about Hinduism? Or does it have to be multiple people?

Thanks.