"inireland" makes an excellent point. Whenever one stays somewhere truly fabulous, it is a good idea not to budget the time such that it becomes just a place to sleep. Ashford Castle, along with Dromoland, Adare Manor, and so many other truly fabulous places are destinations unto themselves. One
should plan to arrive in the afternoon, spend the night, then spend the entire next day totally soaking in the castle, the grounds, the activities, etc., before spending a second night, then still budget enough time on departure day to have a truly lovely leisurely breakfast and maybe one final walk around the grounds before checkout. Both Ashford and Dromoland offer the Hawk Walk,which is an incredible experience. Both castles (at least used to..not certain if still the case) offer special two-night package prices that include breakfasts and at least one fabulous dinner. Both have lakes, bikes, etc.
I actually first planned a trip to Ireland with the specific purpose of visiting/staying at Ashford Castle, but then a family illness caused that trip to be cancelled. But, when we were finally able to go, the trip was combined with more time and meeting a cousin (who showed us the old family cottage, farm, church, school, and graves).
There is a lot to see in Ireland, but it is the type place one wants to allow at least two-day stops somewhere special to soak it all in....even in one is staying in a modest B&B...the same approach is advised.