vortex
ATC is required to apply one minute minimum vortex separation between same vortex type a/c. As Niknak said, some small jets (cessnas LJ's etc) are the same vortex wake category as your cessna. It may have been better for the ATCO to have asked you if you could accept the one minute or an immediate, but if in any doubt you always have the option to refuse line up if you don't think you'll get the prescribed minimum, thereby avoiding a go around.