Portable LP (Hybrid) Grill took 30 min to cook hamburgers, is this normal?

I purchased a small portable propane (hybrid) grill from walmart, model HBT722W. It is supposed to be 10,000 BTU. The reason it is a hybrid is it uses propane to actually grill and has 4 small trays on the corners to place in charcoal or wood for your flavor. It said’s its supposed to ignite them however It didn’t really seem to do much.
I grilled with it one time and it took about 30 min to cook hamburgers. The temperature gauge only got to about 350. Does anyone else have this particular grill and know if this is normal for it? How long should hamburger patties take on this grill? I did not expect them to take anywhere near this long.

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