Yahoo transfer email limits

According to the FAQ it says, "Email messages with attachments of more than 25 MB or in an unformatted format will not be moved. They will be moved to a separate folder in your Xfinity Email inbox, and you will be notified that you have 30 days to download them. Only up to 4,100 folders can be moved. Folders over 4,100 will be consolidated into a single folder."

Where it says, "Email messages with attachments of more than 25 MB", Is that for just one (1) email or for all emails.

What about Folder sizes? 

Is there a limit to those? Note: I one Folder that is about 14MB with about 20 emails.

2 other large Folders total about another 13MB total and a few smaller ones that total about 1MB.

Thanks