It depends on how you want it maintained.
I have a (much) larger garden than that, and although we all love gardening we're fairly busy and can't always dedicate all the time to it that we would want.
Hedges are once a year. My very long hedges can be done in a couple of afternoons if the weather holds. If you don't have time, it's not that hard to find someone to do them usually (I have teenagers, they do it).
Meadows etc. are also cut once a year (again teenagers in my case).
The lawn gets cut at most once a month from May to October, then not at all. We like the wildflowers, so let it get long and only cut it when it's getting really long.
That leaves the flowerbeds, and the veg plot, which are quite hard work and where we put most of our energy. I only do one new flowerbed a year, and plant them packed tight, so that there is less weeding to do. At this time of year is when it's worst. I'm not religious about removing weeds though, only where they bother me. Dh and the dc do the veg in deep beds, which do need daily watering (an automatic watering system helps a lot).