Virus definitions can be anywhere between a few hundred KBs to 5 MBs. They are not that large.
Performing offline tasks such as scanning does not use any data.
windows defender data usage
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Anonymous
how much data would windows defender use to up
date
Windows for home | Previous Windows versions | Windows update
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Anonymous
2018-02-02T22:54:38+00:00 -
Anonymous
2018-02-03T11:44:19+00:00 You are welcome Jodi. https://www.microsoft.com/en-us/wdsi/definitions
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Anonymous
2018-02-03T03:56:16+00:00 Thank you for your reply.
Made sense after trying and waiting over an hour for the download to finish my internet wifi ran out of credit. LOL