CTB_ROOMLENGTH

CT rooms must be at least three *full* lines long. Four lines is better
than three. Five is better than four. The number of sentences you use to
achieve your three or more full lines is up to you, but be descriptive.
You can't use filler and repeated words to get to three lines.

Generally, each of the sentences you use should have 15 or more words with
excellent descriptive quality. You will be edited for content as well as
length.

There is no rule for maximum length, although builders should be aware
anything over 7 lines tends to get complaints from players about spam.

An ideal description length is 5-6 lines. This is usually enough to give
information about the room and still keep a player's interest. Some key
rooms may need to be a little longer, while most rooms should be around
this length.