The MFG specs say 60 led bulb/units use 4.8 watts at 12 volts so that is .4 amps/hr. A common 1270 flasher battery is 12 volts 7amp/hrs so by doing the math (if I did it correctly) means about 17 hrs run time when using 60 led units.
It would be neat see your run times to see if the numbers are real world.
Have you checked the run time on your set up?
How many “bulb” units do you have strung up?