- PTR for Patch 2.6.8 began on 02/06/2020 (Thursday) or 36 days before Season 20 start (03/13/2020). PTR lasted 2 weeks.
- PTR for Patch 2.6.7 began on 10/17/2019 (Thursday) or 36 days before Season 19 start (11/22/2019). PTR lasted 1 week but we had patches 2.6.7a and 2.6.7b also.
- PTR for Patch 2.6.6 began on 07/25/2019 (Thursday) or 29 days before Season 18 start (08/23/2019). PTR lasted 1 week.
Based on this we can expect PTR lead time of 36 days again.
We usually see 12 days between season end and next season start.
- If Season 20 is going to last 93 days or until 06/14/2020 (Sunday) and Season 21 to start on 06/26/2020 (Friday) we can assume that PTR should start on 05/21/2020 (Thursday).
- If Season 20 is going to last 100 days or until 06/21/2020 (Sunday) and Season 21 to start on 07/03/2020 (Friday) we can assume that PTR should start on 05/28/2020 (Thursday).
- If Season 20 is going to last 107 days or until 06/28/2020 (Sunday) and Season 21 to start on 07/10/2020 (Friday) we can assume that PTR should start on 06/04/2020 (Thursday)
- If Season 20 is going to last 114 days or until 07/05/2020 (Sunday) and Season 21 to start on 07/17/2020 (Friday) we can asume that PTR should start on 06/11/2020 (Thursday).
So far PTR was usually announced 3-6 days before its start usually on Mondays (shorter period) and sometimes on Fridays (longer period).
Lets hope we get some news on 18th May or at least on 25th May.