Downtime should be small (less than an hour), but the window of when it will occur is rather vague. I'll update if I get more details.
Scheduled Server Maintenance
We will perform a scheduled server maintenance on 5th - 7th of August.
Duration: 2019-08-05 06:00 - 2019-08-07 13:00 UTC
Downtime expected: Up to 15 - 60 minutes
Purpose: improvements for easier future maintenance, performance and better stability.