Cannot find codes about 90 days prediction at once.

Awesome project!!
I know this project from https://semantive.com/demand-forecasting-3-neural-networks/.
In that blog, I know the author also implement 'multi-step once time'. However I only find 'one-by-one step' in this github codes.
It is very kind if you can provide some practice-oriented codes source for learning.
Thanks!