Op that is not really that much, my garden is larger than that and l manage it just fine,
You have 3 options for the lawn,
Ride on mower which will probably take 45 min to cut once a week
Drive mower(i use one) takes 1hour 15 mins for my 3 tiered garden once a week
Automated mower, more costly but after set up needs no weekly maintenance.
I cut my hedges on all 3 sides with a metre long electric cutter and a tall ladder once a year, it takes a morning/ 3/4 of a day.
It is really not much for the pleasure it will give you!