Board Thread:Game Discussion/@comment-36058154-20181125163841/@comment-33353012-20181126024658

The time when they become free is written in your notification file, but it's in "firetime" format. You can convert it here https://www.epochconverter.com/

Try this : use the free one, then check the time when he becomes available, then do some racing, then check out the time again to see if winning a race shortened the time and by how much