How long does it take for you do to a Heroku push?

Can anybody comment on how long a heroku push takes for their ember-cli-rails app? I have a basic ember app within my rails app and pushing takes > 15minutes, even with the suggested folder caching. 90% of this time is with the ember related setup + build.

I’ve just run some tests using the ember-cli-rails sample app and that is coming it at between 8 - 10 minutes.

I’d love to know if I’m doing something wrong here or if that’s just expected.