I came across the offer by Heroku that says that I can receive free 450 dyno hours for just adding my credit card. I was wondering how the free hours are added. Are they like the standard 550 hours, i.e. added every month or is it just for one time?
Also I just want to run one dyno and so having 1000 total hours per month would be more than enough. So if they add 450hrs/month with the credit card, does that mean I can run my dyno infinitely without being charged at all?