Ahead of his F1 comeback in 2010, the seven-time champion has been allowed to get vital mileage under his belt in the test that has been billed as a GP2 development run.
And although no lap times have been issued from the test, Sears has given away just how quick Schumacher has been - despite the poor weather that has blighted the week.
"I would say that with a track that is not completely dry, with the kerbs wet and everything else, to be less than one second off the quickest ever time is pretty handy," Sears, who has members of his team running Schumacher's car this week, said on the main stage at the AUTOSPORT International Show.