Advice Running 3 10W 12V COB LED on a 12v7AH lead acid battery
You stated your battery is 12V 7Ah battery.

LED (actually the bar light uses 4) is 12-14V (that's the drop), and they say can use up to 10W.  Let's do the math:
$$
I = \frac{P}{E} = \frac{10W}{12V} = 833 mA \\
$$

No sense in calculating at 14V, you're limited to 12V.

$$
3 \cdot 0.833A = 2.499A
$$

So, BEST case, 2.8 hours.  But you really need to see the curve for your specific battery, and it's derating for thermal, etc, to see if it can realistically output 7Ah-- manufacturers (for marketing purposes) usually put the 'best case' information on the battery, but only the datasheet for it will provide the truth.

I'd expect 2 hours and change.  If you put an ammeter on it when you get it, and see how much current it's actually drawing, that will let you get a better idea.