Here’s from another “split ‘em by hand” guy (and gal). We split several cords per year by hand with “his and hers” mauls – and chainsaws. I’m sixty-six, 6’ and 200; she is forty, 5’7 and 135.
We both use six-pound mauls. Although we have several of various weights and shapes, we prefer ones we acquired from Harbor Freight a couple years ago that have a wide head with steep taper and a Fiberglas handle ($18 then).
It would be hard to say how long it takes to split a cord because we work at it when one or the other of us or both have a chance, feel like it, or need exercise – and the quality of the wood makes a lot of difference.
When we have a friend’s splitter available we do the “easy” stuff by hand and leave the gnarly pieces with knots and crotches for the splitter (maybe 5 or 10% of the total). The oaks (excluding live oak) are a delight to split – particularly Red Oak.
The splitter (an MTD 25 ton, 6hp Briggs), with about a 15 second cycle time, is pretty slow in good splitting wood and a waste of fuel. Either of us can split more rounds of any good splitting wood with a maul than the machine can do -- for an hour at a time. The splitter is wonderful and much appreciated for the tough pieces though.