Championship leader Lewis Hamilton says he is not fussed by the lack of running during Friday's practice sessions for the Russian Grand Prix.
A fluid spillage caused by a track vehicle disrupted the first session while the second session was scuppered by wet conditions, with Hamilton among several drivers who opted not to post a time.
Hamilton, who won the inaugural event in 2014 and holds a 48 point lead in the championship, played down the lack of track action.
"Today we had to just sit and wait," he said. "We watch and hope that the rain stops. We did learn something today as we went out and tested a wing and got some information on the single lap run.
"But from my point of view, there is not much to learn from today. I don't have any concern about today as everyone is in the same boat so I hope that tomorrow and Sunday is better weather-wise. We feel confident about the weekend and we will find out more tomorrow."
Team-mate Nico Rosberg also opted to avoid substantial running during the second session.
"Saturday and Sunday will be dry, so it didn't make any sense to run any longer," he said.
"We have to squeeze it all into the third session and learn everything within this hour. This should be a bit more of a challenge this weekend as Ferrari will be a threat on this track."