We don't set an hourly limit, as you're not charged per hour. You share your designer with a very limited number of clients; therefore, some days you’ll get more design work done, and other days you might get a bit less. Although other design services allow around 10 clients per designer, we believe our ratio is better, so things don't get rushed out and your designer has more time to be creative and focus on details.
As long as there are requests in your design queue, you get a minimum of 2h/day worth of design work (apart from account management's and quality control's time). Since not every client sends in design requests every day, most days your designer is able to dedicate even more time to your requests.
We're completely transparent about how we work, so reach out if you have more questions.