What is an acceptable word count for the summary on the back of a book (the blurb?)?

memora

New member
Hi everyone,
Is it called the blurb or a summary on the back of a book?

I have just reached the finishing stages of my non-fiction book and I think I need to lower the word count on the summary for the back cover - I'd really like to include as much info on the book as possible, could anyone tell me what the word count needs to be?
Many thanks in advance :)
 
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