I’m afraid the answer is: “it depends”. At a minimum, we need to wait for the automated checks to run (about 20 mins), and we need at least one other person on the Team to review/approve the PR. That can take anywhere from minutes to days, depending on availability/priority.
If it’s a more complex change, or if the reviewer has any comments that need addressing, then it can take even longer than that.
By the way, when we link a PR here on Meta, you should see a little coloured badge on the onebox which tells you whether it’s merged. For example: