The Dash Core Group plans to release a network update every six weeks starting with a release between April 22 and May 5
Source: https://cointelegraph.com/news/dash-core-group-to-update-platforms-evonet-testnet-every-six-weeks
Dash Core Group to Update Platform’s ‘Evonet’ Testnet Every Six Weeks
April 20, 2020
CoinTelegraph