We opted for a customer 12 day option, with an extra day (well, a 13 day option?). The extra day was special for 2022 - with stories of airlines canceling flights. We wanted to be sure we arrived in time for our tour!
Ireland by Bike (the tour operator) delivered our bikes a day earlier, effectively extending our tour, and provided an extra route! I thought that was a very thoughtful surprise. We found that Ireland has lots or wonderful, thoughtful, friendly people, which made our tour enjoyable and low stress.
I rode a hybrid bike and certainly noticed the tour routes were not flat; my wife had an ebike and climbed hills faster than I did. We both loved the varied terrain. Doing the tour self-guided let us set our own pace with no pressure.