At the speed of glaciation. Another reason to stick with Spanish!
No kidding ... I had occasion to peruse a Spanish language missalette some years ago, and immediately realised that we've been robbed.
1) The Spanish translation was both closer in form to the Latin, and much more elegantly phrased than the bureaucratic ICEL English.
2) The hymnal was vastly better, both musically and doctrinally, than the OCP/NPM dreck foisted off on the average English language parish in these United States.