Dag Donux..
De officetagging lijkt me oke.
opening_hours 
De 'waarde' van de tag gaat meestal in UK English. 
BV Mo-Sa 08:00-13:00,14:00-17:00 || "by appointment"
Useful in multilingual areas, and/or for adding a description in a widely understood language such as English (e.g. defibrillator:location:en=*) 

https://wiki.openstreetmap.org/wiki/Key:opening_hours

Groet
eggie