How long will 1x1 LitePanel last with one 90Wh battery?

Basically i'm trying to gauge how long 90Wh battery can power 1x1 LitePanel at full power. Anyone knows the math to figure it out?
 
time-in-hours = watt-hours/watts-consumed

If you have a 50w panel then

T = 90/50 =1.8 hours

Of course, if the battery vendor or the lightpanel is lying about their specifications, you may get significanlty different results.
 
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