For long does it take to get 1m users? Well, for most people it takes forever, as it never happens.
But here’s some numbers on the biggest, fastest (or best at getting PR) ones out there. It’s quite useful if founders doing projections for investors:)
-iPhoto iPad app: 10 days.
-Instagram: 2,5 mth (downloads, not users*)
-Spotify: 5 mth
-Fab: 5 mth
-Dropbox: 7 mth
-Banjo: 9 mth
-Wunderlist: 9 mth
-Facebook: 10 mth
-Path (new one): 12 mth (downloads, not users*)
-Foursquare: 13 mth (downloads, not users*)
-Evernote: 14 mth
-Tumblr: 20 mth
-Pinterest: 20 mth (uniques, not users**)
-Twitter: 24 mth
*Some of the mobile ones have released downloads figures, this is hugely different to users. Rule of thumb, divide in half for users.
**Pinterest is quoted for unique visitors, this is even more different. Hard to say a rule of thumb but probably divide by 10 for users.
Know others? Write them as a comment and I will add to the list. Made it? Let me know and we can get a more varied list than just the big ones.