Hi, if you're using a smartphone and there is no way to edit opening times in StreetComplete, then I think EveryDoor app  had this functionality. You can also take a look at Vespucci, maybe it has something.

From PC head over to 
https://www.openstreetmap.org and click edit,
but make sure you input time in a correct format. 
https://wiki.openstreetmap.org/wiki/Key:opening_hours
You can check here https://openingh.openstreetmap.de/evaluation_tool/