Its is a realistic commute.
you can do that in 1 hour on a motorbike each day, eastlink is free and no need to take the tunnel on a bike it saves very little time and costs to much. cost me €7 a day return + bike and insurance (€7).
The mathews coaches are great
it adds 45mins to the journey, mainly getting other busses across dublin
i found them impossible and was late, I found getting trains and connections was unreliable in terms of timing.
If driving it may be worth doing the loop round the M50 the M1 to M50 has been greatly improved and with the tolls of the M50 its free flowing.
If its a job where he can afford to use the tunnel and eastlink you could drive it.
in the end I did decided that it was only a matter of time before i came off my bike, several near misses in town mostly with Taxi drivers. but great fun.