Editing subscription description under product

Site URL: https://www.uncutstems.co.uk/

Hi,

I'm wondering if anyone knows a clever way to edit the subscription description under a product. My product is delivered once a fortnight from March-November, a total of 20 payments, but the description looks like it would be 40 payments. 

Is there some clever coding I can use to change this that anyone knows of? It would be so much clearer if it said 'Every two weeks for 9 months' or something (anything!) else.

thanks,

Vicki