Well - I have heard of dispatchers doing doubles like that in an 8+8 fashion.
Work the first 8 hours as a dispatcher cranking releases and working a desk.
Work the 2nd 8 hours as an ATC coordinator (their internal requirements for the position requires the ADX certificate, however, since they arent "exercising their certificate" the el Federale says thats ok.
And this is a union shop that this happens in; happens all the time.
I know guys at UAL and COA that do this. Most of them on their last day, and going in to days off.
It is different from working consecutive 8 hour shifts as a dispatcher.
I didn't like quick turns either, one was draining and two in a row was outright brutal. I am glad it didn't happen often. That carrier operated with just 5 line dispatchers for 14 years, before they figured out having a vacation/relief dispatcher would be cheaper than paying OT. The downside of course, is the first 5 dispatchers lost 10k or more per year in OT.