I wax the chains on my 4 bikes and reuse the KMC, SRAM, and now Shimano quick links all the time. On my dedicated trainer bike I have about 5k plus miles on that link and never had an issue.
The only chain I have ever snapped was a KMC hollow pin and it didn’t break at the QL. I also carry a spare QL that is concealed with Duck Tape under my seat (I’m too cool for saddle bags).
