Teams are converted to bots on the Monday morning after they have been inactive for 42 days (6 weeks). It used to be 35 days (5 weeks).
So a team will become inactive somewhere between 42 and 49 days after they last logged in, depending on which day of the week that was.
Teams that last logged in between April 7 and 14 will become bots next Monday morning (local time) in their country. The timeout appears to be calculated 42 days x 24x60x60 seconds, so some April 14 teams will not become bots.
There may also be so tweaks of a day or so based on country. Bot'ification is done on a country by country basis on Monday morning local time, beginning in New Zealand and proceeding westward. I also don't know what time reference is used for the last login date. When the servers were moved from Europe there were more teams on the last date that did become bots.