Validation condition Syntax

Dear all,
I have this following issue

C0.7. Which crops did you grow in %shadenet%, in the last 12 months?(Multi-select question)

C0.8. In the last 12 months, how many production cycles did you have, that you ACTUALLY cultivated in %shadenet%?

I want to make a condition such that C0.8. Length>= c0_7.Length
Please how should I proceed?

Hi @RobinsonT

If C0.8 is a multi-select question try it:
In a validation box in C0.8 put it