I use (2) tractors for cleaning up leaves each fall and they always make short work of it. I just finished my lawn tonight and it took about an hour to clear 1.5 acres of heavily-tree'd manicured lawn. I use a 42" sweeper behind the first tractor (Wheelhorse 12hp gear-drive with mower deck removed). I run this tractor as fast as it will go, pulling the sweeper, dumping each time out back on a "rough" 2 acre area, never slowing down to dump, just pulling the rope. I end up with all the leaves out back, scattered on the rough, which I then push into a big compost pile using a light-weight, 4.5 ft snowplow on the front of my 10hp Farmall cub. That little plow and light tractor does a fairly good job on the leaves, causing little or no damage to the "rough" lawn and gathering up at least 90% of the leaves. It is nice to not deal with complicated, expensive machinery like vacuums, and to have all that compost available next spring. I have less than $25 invested in the garage-sale sweeper and the plow was free, and also works good for clearing light snows all winter. That 1 hour clearing leaves is something I look forward to each fall. The kids always have a ball playing in the big pile.