It’s species-dependent. Our red and white oaks take 5+ years to break down. Others break down just fine over winter, tyvm.
And if there’s a lot of leaves, it shades out and kills the grass.
Mulching the leaves in place is perfectly fine for your lawn. But a better place for them is covering your perennial flower beds. Then rake off what doesn’t biodegrade in the spring and move that crap to the compost pile.
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