Adding time frames in Parents' Guide section

There is no separate data field reserved for that purpose, but so it is generally alright to indicate within each item at what point in running time the scene described in the item takes place and for how long. However, inclusion of the time points may warrant a spoiler tag, in some circumstances. This "skip" approach really only works for movies that have plots structured in such a way that very unsuitable scenes, sequences or shots do not occur regularly throughout.

I would go a little further, and say that time tags very often do create spoilers (as does indicating who is involved), and urge you to place items with tags in the Spoilers section when in doubt.  This is especially true for items that are key to the plot, and even more so for items that begin "at the end"!