Our HQ is in London (UK), but since our clients are all over the world, so is the team.
Our whole team works full-time and remotely, with a flexible working schedule. We operate with 1-business-day rounds for requests and revisions, so different time zones are never an issue. Every client gets replies and design updates within 1 working day (depending on their subscription plan).
There isn't a set time for replies or delivery, but as long as there's a request in your design queue, you'll get daily updates, even if the designs are not completed yet. Sometimes it’ll be quicker, and sometimes it might take a bit longer depending on the complexity of each request.