I run long Count operation (sync version), that use 10 sec query (in this case its normal).
We can't use async version for some reasons.

...

cancellationTokenSource.CancelAfter(1000);

GetCollection<SomeModel>("SomeModel").Count(filter, cancellationTokenSource.Token)

But Сount whatever takes 10 seconds. Why it is not cancelling ?
Or it check it only before start ?
I know about MaxTime, but we need to set time limit for many operations and this bug cause use us bad design code.