I owned 6.25 acers and mowed 3+ with International Cub Lo-Boy mowers for years. It took about 4 hours in August and 6.5 hours in May!. The last 2 years we lived there I bought a Cub ZTR 42" with 23 HP Kawasaki gas engine ($3500). It would take 2.0 hours in August, and 2.5 in May. This version has the twin push steering which is a No-No if you have or had carpel tunnel.
Pluses:
Time savings, at least 50%
Fuel savings, at least 30%
Lawn looked like a golf course!
Minuses:
Cost, $1000 over similar size (slower) lawn tractor
Can't plow garden or push snow!
Little traction on big hill and ditches.
When I sold our country place, I offered the zero turn to a friend from church. She went to the back yard and mower about a half acre. She started with "Round and Round" like with he little tractor, then did back and forth, then did diagonal (like a ball diamond) Took maybe 5 -10 minutes the figure how to go straight and about 6 corners to do good 90 degree turns. Then she started going faster, and faster! and hooping and laughing! Last thing I let her do was: First mow around a phone pole, when she got that down I had her mow around a grove of 4 apple trees.
She got off with a huge smile on her face Looked me in the eye and said "No Thank You!" So I sold to a guy in the next town for twice as much. Come 2 years later she bought a bigger zero turn for herself.
My brother has a 60 inch Kubota and a friend has a 72inch X-mark turbo diesel ($26,000)! They make the 42 and 48 inch models that have steering wheels. My Son-In-Law has a 32" with push steering so he can commercial mow back yard with fence gates. If you go to a real dealer and not Lowe's or Home Depot, they can get just about anything you want! But that was pre covid, Now they can put you on a waiting/wish list that may take years to fulfill.
Ivan
ETA: My F-I-L has a 48" Bobcat brand , mows 6.6 acres and has not had any serious issues in 10-12 years. He's 87 last January and the push steering has not bothered his wrists! He is known to mow a neighbor or two's lawns just because!