How long will the Export take?
It’s difficult to estimate the exact transfer time for email exports. The size of your Comcast.net email account has the most significant impact on transfer time. Typically, 250-500 MB (thousands of messages) will be transferred per hour. Larger accounts take longer to export, so if you plan to delete many emails, you can save some export time by doing so before beginning your export.
Typically, contact exports finish in less than five minutes but may take longer depending on the number of contacts.