Good afternoon bobs mum, pigale and tatters!
l don't think there's a limit on the number of letters for your choice of word, longer phrases might make things more interesting!
I'm working through a book of Bunthorne puzzles at the mo and here's one that came up recently...
Cry from the 15, "Bosom OK, is m' behind guilty?" (4,2,3,4,3,2,4)
The answer to 15 was Changing Rooms
(Hint- it's an anagram!)
:)