Time in

Time in is a subjective concept that indicates the amount of time a person has spent living as part of the BDSM culture in a relatively public fashion indicates their experience level with BDSM.

Criticisms

While the amount of time spent as part of the public scene, or relative age of a participant may in many cases give some insight into their experience level, in many cases making such assumptions can prove patently false.

The age of a participant or time perceived as a member of kink culture on some level does not necessarily indicate any sort of experience level. It is not the time in that matters, but how that time has been spent. More importantly, everyone will have ample opportunities to show their levels of experience or lack thereof, and everyone always has something more to learn. Even the best of the best are sure to keep an open mind and listen to newer explorers for potential bits of wisdom that might be learned.