There may well have been a bigger delta in usage from Sunday Jan 3 to Monday Jan 4 2021, than for any particular pair of days in March-April 2020. Of course 20

There may well have been a bigger delta in usage from Sunday Jan 3 to Monday Jan 4 2021, than for any particular pair of days in March-April 2020. Of course 2020 saw an increase, but it was smeared over a week or a month rather than being a big jump in a single day after everyone's holidays.