Add Landing PRs Section

ONBOARDING.md

@@ -21,6 +21,11 @@ The Node.js project has adopted open source practices to organize our efforts, i
 ### Pull requests (PRs)
 [Pull requests in Github](https://help.github.com/articles/about-pull-requests/) are what we use to put documents, code, and other material into the project. PRs have the advantage to giving everyone involved time and space to add material, suggest changes, and discuss the contribution.
 
+### Landing PRs
+Before landing pull requests, sufficient time should be left for input from other Collaborators. Leave at least 48 hours during the week and 72 hours over weekends to account for international time differences and work schedules. Trivial changes (e.g. typos or content changes) may be landed after a shorter delay.
+
+Where there is no disagreement amongst Collaborators, a pull request may be landed given appropriate review. Where there is discussion amongst Collaborators, consensus should be sought if possible. The lack of consensus may indicate the need to elevate discussion to the Community Committee Members for resolution
+
 ### The Consensus-seeking Model
 Consensus is the first choice for making decisions. The CommComm uses a "consensus-seeking" model for issues that are escalated to the committee.