I don't use it very often, although that is very good to know. Knowing it would only be used 4-5 seconds at a time, I still used heatsinks as the schematic called for. I used the correct to-3 heatsinks for the transistors, as well as one on the 7810 regulator itself. I know in other applications, amps, etc., the heatsinks the transistors rest on are massive. When testing the circuit, I played it about 6 or 7 times within a few minutes, which is way more than I would normally, all the components were still cool to the touch.
At the end of the day it's just a cheesy musical air horn, lol, I just wanted it to work and sound as I thought it should.