Several points:
1. I have the UK Blu-ray box set of A Nightmare on Elm Street 1-7, and have noticed that in the database the runtimes for movies 4 & 5 are both wrong (I assume they are wrong for ALL the Blu-ray releases, not just the UK one).
Currently they are both listed with runtimes of 85:37, but this is the runtime for movie 2 (Freddie's Revenge).
movie 4 (The Dream Master) should be 93:15
movie 5 (The Dream Child) should be 89:38
2. I think, but am not absolutely sure, that this Blu-ray release (and presumably all other Blu-ray releases) of movie 5 (The Dream Child) are the R-rated Theatrical version (and not the unrated version that apparently exists on some VHS releases). I also have the UK DVD 1-7 box set, and according to the database, the DVD of The Dream Child in this set is the R-rated version. The UK DVD runtime is 85:51 PAL, equivalent to 89:26. Hence the Blu-ray at 89:38 is effectively 12 seconds longer, although about 6 seconds of this is due to a different New Line Cinema animated logo at the start. On IMDb, the alternate versions page for this movie:
https://www.imdb.com/title/tt0097981/al ... c_ql_trv_5
has seemingly contradictory entries, suggesting both that the unrated version is 15 seconds longer, and that it is 91 minutes long (about 1-2 minutes longer).
3. The runtimes for the UK DVD box set releases are not currently listed in the database. If you wish to add these in, they are as follows (all PAL):
1 87:31
2 81:56
3 92:31
4 89:23
5 85:51
6 85:30
7 107:32