Slow maneuvers are those that take longer than a single turn to execute. Some may be on the scale of a short or long rest, in which case they cannot be used in combat. Other slow abilities, such as most rituals, have a more precise execution time (or casting time) specified in seconds, minutes, hours, or some other defined unit of time. These can be done during combat so long as a round doesn't pass without the creature executing them using Sustain at least once.