Study Time in my profile (at least) seems to have broken / changed by April 16. Sometime after April 15, my profile study time began to be reported numerically. Example:
4/15/25: 26 minutes
4/16/25: 2.4k
4/17/25: 1.3k
4/18/25: 3.8k
The figures after 4/15/25 could have conceivably been converted for some reason to seconds of listening instead of minutes of listening. @BillF444’s 26 minutes of listening on 4/15/25 would be 1.56k seconds of listening.