Formula 1 races will revert to starting at the top of the hour in the 2021 season, the sport has formally confirmed, while Friday practice track time has been cut by an hour.
Grands Prix had started 10 minutes past the hour since 2018 but that change has now been reversed for the new season.
Meanwhile, Friday's two practice sessions will now each run to an hour in length instead of the traditional 90 minutes.
Most European races will start at 3pm local time, which is 2pm for UK viewers on Sky Sports F1 (the British GP will start at 3pm local).
F1 is planning for a 23-round season but the third event, which was originally meant to be China, remains unconfirmed. Portugal's Portimao circuit is considered the front-runner after making its debut on the much-changed 2020 schedule last autumn.
Bahrain opens the 2021 campaign on March 28, with their event to run in the evening under floodlights as usual. The season-opener will start at 4pm UK time.
Less practice time, but more condensed action?
F1 had held two 90-minute practice sessions on a Friday since 2007 but there have been consistent calls in recent years to reduce running time ahead of qualifying, to both ensure busier sessions when cars are on track and increase chances of unpredictability later in the weekend.
With limited tyre allocations and penalty-free engine parts, teams chose not to use significant amounts of Friday's 180 minutes of track time with their cars.
Following Friday's announcement, Sky F1 commentator David Croft tweeted: "A welcome move & one that I hope eliminates the often long periods of track inactivity. It shouldn't result in less laps completed."
Practice Three on a Saturday will continue to run to 60 minutes.