Effective March 1st, 2022 Render will impose build limits for static site and free plan services. For paid services, there is no limit to the number of builds you can trigger. All services (free or paid) can only have one concurrent build per service, and triggering a new build will cancel any existing running build for that service.
Static sites and free plan services are limited to 400 build hours per month. This limit is tracked in aggregate for all static sites and free plan services on your account. Once you reach this limit you can either pay for additional build time or wait for the limit to reset on the first day of the next calendar month.
You can configure a maximum spend amount for build time exceeding the 400 free hours in your billing settings. After your account has used the 400 free hours in a calendar month, builds cost $0.0002/second. Once your maximum spend amount is reached (or if you configure a $0 max spend), you will not be able to trigger new builds for static sites and free plan services. Auto deploys will also not trigger new builds for these services.
View your build usage in the Billing page of the dashboard.
Please review our deploy documentation for more information on auto deploys and how they can be configured.