Maybe not chickens then! Don't want to commit to too much.
Nah, chickens are easy. Get yourself an automatic door opener and you never have to let them out or shut them in yourself. Check feed and water every few days (buying large feeders/drinkers helps here), check for eggs daily. Clean out as often as needed. I think I spent about 10mins a day on my chickens on average, if that (whilst the dog goes and does his morning business
).
If you have grass you should to only mow occasionally
. Sheep, chickens, ducks, geese etc can do all that for you if you manage them right. Hedge cutting is a pain, and I don't think there are any animals you can employ to do that for you alas. You need to think about why you are mowing/cutting/strimming - are you doing it just to make it look tidy? Remember that lots of wildlife thrives in the less tidy areas...
Pigs are great but will take up a lot of your time with their daily feeding (unless you have something automatic) ... also you will waste a lot of time sitting and watching them
(although enjoyable).
I think woodland tasks are more winter ones, so that you are not disturbing breeding birds etc, and you can see the wood for the trees when they are not in leaf. So you could be twiddling your thumbs in summer in a woodland.
Reading up on permaculture will help you minimise the time and effort involved in doing routine things, if you plan it right from the outset.
Holidays - what are they again? Haha. You need to find a relative / friend / trusted person to house sit when you go away if you keep any livestock, or a kind neighbour who can look in on them (in return for some produce).