Congratulations!
I might just be getting a little over exuberant. An 8 month wait would also work for us seeing us in Australia just in time for Christmas by the time I worked notice etc. What would be frustrating would be 90% within 21 months as that would impact our plans greatly.
From memory we uploaded about 80 documents with many of the documents covering multiple pieces of evidence. For example if referencing some international travel we'd include photos and tickets in a single document. For WhatsApp messages we combined them all into a single document. Note sure if that's a lot of evidence or typical.