I ramp my blue LED's from 10am-11am, stay at the desired percentage until 8pm then ramp down until off at 9pm.
Whites start ramping up from 11am-12pm, stayed at desired until 7pm, then ramp down to off at 8pm.
So with that said, blues (in your case Actinics) go roughly 9hrs (minus ramp up/down).
Whites (yours-Halides), 7hrs.