According to the BBFC website, Gareth Edward’s Godzilla has been passed uncut and has been certified 12A. I’d expect the Irish Certification Office to award the same and the movie has been classified PG-13 in the States. At least with the movie being uncut, audiences will be getting the full Godzilla experience, knowing that a scene may not have a second or two shaved off to keep within the particular confines of a particular rating. The BBFC class the movie as having moderate violence and threat.
The running time has also been confirmed (again by the BBFC website) at 122m 56s, or just shy 2 hours and 3 minutes.