If you've tagged on inside the P2P zone, and tag off outside, it knows where you tagged on and will deduct the correct fare. My P2P is Drogheda to Lansdowne Rd. I'm gone Pearse to Dun Laoghaire and it worked fine.
What I haven't tried yet is combining a P2P journey with a PAYG journey, such as Drogheda to Dun Laoghaire. I could see this causing problems as the journey could easily be over 90 minutes.
James
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