Can a mouse pregnancy last for more than 20 days?

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My female mouse started showing pregnancy signs 3 weeks ago. Big fat body, nesting started last week.It has been over 20 days now. How long should I wait for? She has been wormed and follows strict healthy diet. Please help. Children and I are anxious.
Thank you.

i think about 36 i’ve gone thru it before plus with alot of diffrent pets most animals are 36 i think
21-25 days but no longer than 30, if she goes longer than 30 either she is not pregnant, or something is wrong.
more info on my site
http://cochrunrodentry.angelfire.com