Should I get a St Bernard? Questions

I was wondering the exact same thing Jackie collies need over two hours exercise a day by what I have heard and when I looked on the kennel club they said St Bernard's only need up to an hour a day which is about right as it is a half hour walk to my farm and half hour back as well as free time to run around while I muck out the horses and deal with the other animals my Dalmatian and Chihuahua are exhausted by the time they get back home and just sleep I am doing research into other breeds but St Bernard's are still at the top of my list