BreakTimer allows you to set up customizable breaks and will remind you to take them.
identifier "com.tomjwatson.breaktimer" and anchor apple generic and certificate 1[field.1.2.840.113635.100.6.2.6] /* exists */ and certificate leaf[field.1.2.840.113635.100.6.1.13] /* exists */ and certificate leaf[subject.OU] = Z4W3B3QCM5