I honestly don’t know, we were just visitors to Dublin maybe if you email them they’ll be able to advise.

They are working on the Gaol so not taking bookings just turn up and wait

It was an hour and a half.

at the moment they are doing renovations so only doing half hour tours at the moment we just turned up on the day it was 3 euros and brilliant can not wait to return and do the full tour

I was with a Parkinson's group, picked our date, contacted Gaol and tickets made available. Perfect

most of it is

I'm not sure if there is any time restrictions to purchase. I purchased online the day before our visit. Very simple process with an eticket to your phone.

We visited their website and purchase the tickets in advance for a specific time period you may be able to purchase them when you get there but I would suggest purchasing them in advance. It's a great tour

You can purchase them in advance by going to their website. I believe I mentioned this in my previous post. Unfortunately, tripadvisor does not allow hyperlinks, but Google "Kilmainham Goal" and go to their website to purchase tickets. You can select the date and time that work for you. They have a cafe there if you arrive early and want s small bite to eat and drink.

Hy Better you buy the tickets online, a day before visit. There is always a long queue and you have to wait a long time, with the online ticket you can pass the queue and get directly into the building.