It is very variable since it depends on the time, if it is a business day or not, on how many moderators work at the moment.
It is usually a few hours, and on very busy days it can take up to 24 hours.
Premium users take precedence, and non-premium users who change their photos too often are lowered in priority in the validation queue.
We validate thousands of photos a day, so the most important thing is to be patient!
While we validate your photos, you can send the same photos by private message or put them in your private album that does not require validation.