Frank, at the moment there are 17 people booked into the hotel in Donegal. On the facebook page 21 people have said they're going and there are 12 who have said maybe. That's as much as I know.
The route will be Dublin-Clonee-Dunshaughlin-Navan-Kells-Virginia-Cavan-Butlersbridge-Newtownbutler-Lisnaskea-Enniskillen (lunch stop)-Beleek-Ballyshannon-Donegal town.
There is a visit to Slieve league to be done and if it's not too late when we get to Donegal and the weather isn't too bad we could do it on Tue evening. Otherwise it will be on Wed morning - with a bit of a lie-in for those who were up late the night before
We'll leave Donegal on Wed morning at 11am (earlier if we do Slieve League on the Tue evening) and head for the Giant's Causeway via Ballybofey and Derry. We should arrive there about 1.30 / 2pm and we'll have lunch at the Causeway Hotel. Then it's around the Antrim Coast arriving in Belfast in the late afternoon on Wed.
As Jockser has said, I don't want to be too prescriptive about how people participate in this. Some go faster than others, some like to stop regularly for a smoke etc, so I'm going to leave it to each one to go at their own pace. People can buddy-up or go solo, whatever works. I imagine that if we all leave Dublin at 11 we'll all arrive at Enniskillen within a relatively short window anyway, and so on.