It's about a 1 and a 1/2 to a 2 second blink. And it was like that with all incandescent bulbs.
I just know some stupid CA impatient commuter hybrid or rice rocket racer is going to slam their car into the rear of my flat bed and kill them self, just because they don’t see my blinker within .00001 seconds. I probably wont even notice it when they hit me. There are a bunch of morons out here.