Yet another question about cues vs instrumentals

I'm working on a couple of tracks for a listing that asks for the usual 1min30 for cues and 2 to 4 mins for instrumentals.
One of my track is currently just over 2 minutes, which would qualify as an instrumental, but it doesn't have the verse/chorus form. It's more of an A/B/B type of structure.
So my question is: do instrumentals need to stick to verse/chorus/verse/chorus/bridge/chorus form, or does anything that's over 2 minutes qualify as an instrumental?
Thank you!