Godzilla Run Time

Well, that's one weird rating system.

The rating just means that some scenes might not be suitable for younger children, but, there is no age restriction. Its bascially the same as the pg-13 rating, only that they put an age of 13 with the other.

What people don't tend to know is that there is NO age restriction for a pg-13 film. It is only a suggestion to parents that they should accompany a child who's going to go watch the film. A Toddler could buy a ticket to a pg-13 if they wanted. 

It is also stated by IMDB that Godzilla will be 123 mins.