Calculate average time to accumulate to a value.
Consider a dataset like this: Person | Topic | Points | Date --------- | ------- | -------- | ------ John | Foo | 80 | 2020-09-10 John | Foo | 40 | 2020-09-12 John | Bar | 63 | 2020-09-14 Sally | Bar | 60 | 2020-09-16 Sally | Foo | 90 | 2020-09-16 Sally | Foo | 110 | 2020-09-18 Assuming the dataset is much larger with more…
