My T-1 says setting 8 for five years of continuous on. This is the ideal setting when my carbine is inside the house for HD, but when I go out into the mid day sun, it needs to go to 9 or 10 (usually 10). The lower "daylight" settings are primarily for use at dawn/dusk and inside buildings or under a forrest canopy where you don't want the dot to bloom out. No worries about having to run yours at a higher level as that is normal.
"You have never lived until you have almost died. For those who fight for it, life has a flavor the protected will never know." - Written by an unknown soldier in Vietnam.
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