Mercedes team principal Ross Brawn has warned that it would be a mistake to have more than 20 F1 races per season.

The current campaign is being contest over 19 grands prix after the decision was taken to delay the proposed event in New Jersey.

The New Jersey race is slated to join the calendar next year though, after a twelve month delay, while Russia is also set host an F1 event for the first time at the new circuit being build in Sochi. With Austria returning - and India dropping off the schedule - that could mean there will be 21 races, assuming all of the other events in 2013 are retained, and Brawn reckons that could be problematic.

Related Articles

"Twenty races is pretty challenging for the teams with one crew of people," he told British newspaper, The Daily Express. "I think you reach a need point that when you go beyond it you have to start looking at rotating people, rotating crews.

"That gets very difficult, particularly with the engineers because they are very closely linked with their drivers.

"That's not an easy thing, but with some of the technicians and mechanics and so on we can do that.

"But 20 races is pretty intense for everyone. One more is only five per cent more; two is only ten per cent more. But it really does start to get difficult to manage, so I think 20 is a sensible limit."

Brawn's views echo those made recently by some of the other team principals and some of the drivers at the recent Hungarian Grand Prix.