The reason there isn't a number is that the way Parliament designed the benefit wasn't just looking at the 2019 tax income to determine eligibility. People could also use the first three months of the year, so it could be any 12 consecutive months.
That's what's taking CRA time, in terms of giving people the chance to explain whether they had additional income that would put them over the income threshold. They're working with them, as you indicated, Minister, on flexibility on the repayment side.