Some examples and use cases from the internet:

Some examples and use cases from the internet:

• 2.3. the transport must be authorised by the competent authorities, who must be contactable 24 hours per day, 7 days per week,
• is designed to be operational 24 hours per day and 7 days per week;
• Hence, many are 'on call' 24 hours per day, 7 days a week, 52 weeks of the year, with little or no opportunity to enter paid employment or to enjoy a normal social life.
• the emergency must be documented by the veterinary surgeon on call 24 hours per day, 7 days per week;
• Ability to work 24 hours per day on more than one site for 10 days.
• Ability to work on one site 24 hours per day for 7 days.
• 2.1. the emergency must be documented by a veterinary surgeon, on call 24 hours per day, 7 days per week,
• the transport operation must be authorised by the competent authorities who must be reachable 24 hours per day, 7 days per week;

• It doesn't look like this phrase is very popular! The search could not find any examples on the internet.