Platycodon (Balloon Flower)

I started some Balloon Flower seeds following the instructions on the pack and what I found online. The seeds were surface sown. The pack and online sources list 14-30 days for germination, stressing the 21-30 days part.
Mine germinated in 5 days. Isn't this way off the curve for average germination time? Anyone else have seeds germinate this quickly for Platycodon?
Just interested. Thanks.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.