Here's how it was for older ex pios. The requirement was 1200 hours per year. The letter back in the day had the hours you had reported at the top of the letter. If it was 1150, not good. Unlike the rest of the congregation, you reported direct to Bethel.
You could be de-listed, struck off from this unpaid "privilege". Serious illness was not a valid excuse. If you wanted a vacation you had to do 100 hours plus per month to build up a surplus of hours, otherwise, don't even think about it.
Don't forget, most of us had to work for a minimum of 2 days a week to maintain even a subsistence living.
So, yes in answer to your question we got a letter each year.
Edit to add. The slogan of the day was "Early in the day, Early in the Month, Early in the Year"