I am a 2nd Dan in Soo Bahk Do Moo Duk Kwan. Also NatGeo, Tang Soo Do is Korean and is an earlier version of SBK MDK. It is not the same as Karate (although the names mean almost the same thing), but since you think it is I suspect you are training in an unofficial offshoot of it, sorry. If you want a history of it if you don't believe me or want to find out more, Wikipedia has a pretty accurate history of events.
Anyway I train 3 times a week, minimum of a 1 hour session each time but sometimes 2 or 3 hours depending on what's happening on the night. I am also an instructor in training and I train kids and adults too sometimes (even though i'm 15). They don't mind.