Awesomic does not re-sell human hours like Upwork. Instead, we guarantee a business result. So the time designer spends on a task is more depending on the type of task.
Some tasks are really possible to complete within one day – like banner ads. However, some tasks require iterating a week over week to fully complete – like a good website created from scratch. In this case, you'll receive everyday updates to see the progress. The whole speed depends on designer output and feedback from clients.
The best way is to ask the designer for a kind estimation when the deadline matters. With urgent projects you can double/triple your subscription, for example, for this exact month, so more designers would be able to connect and deliver results faster.