Change , globally, time group for multiple time conditions

Let’s assume we have ten time conditions (for ten different extensions routing behavior) pointing to the same time group called “summer time”.
Wen we have to switch all ten conditions to a time group called “winter time” , how can we manage things to avoid to modify all ten conditions ?
Should we simply use a single time group and modify its time range when needed instead ?

If they all follow the same schedule, then yes make a single time group.