I usually allow for around 30 minutes to travel through Dublin Airport. Depending on where your plane comes into you might have a fair walk to baggage reclaim.
How long does it take to go through customs in Dublin?
The actual customs part of the airport will unlikely detain you. It will take approx 30 mins to get through immigration from landing, and assuming there is no delay with the baggage coming out, you should be good to go.
How long does it take to clear US customs in Dublin?
What time should I present at US Preclearance? We advise passengers to arrive to the airport 3 hours in advance and try to clear US Preclearance at least 2 hours in advance of your flight.