Depends on company. Keep in mind we have 168 hours a week 1. company with <=20 engineers (or slow paced open-source) in one time zone. Except night time, you

Depends on company. Keep in mind we have 168 hours a week 1. company with <=20 engineers (or slow paced open-source) in one time zone. Except night time, you need constant running server for ~10 hours a day. (except weekends) = 50 hrs/week 2. company with 20 engineers in different time zones. CI running everyday except weekend = 120 hrs/week 3. if you have more engineers, then probably you need running CI every day. If you are a small company, in one region, it might make sense to fully rely on cloud, for other scenarios dedicated servers could be cheaper option. Highest cost is initial setup if automation is difficult.