The simple answer is “ there is no Avg time”
Order depends on many thing like your gig including description, sample, services, price and buyer request.
Make high quality gigs (as many as allowed)
Add the best portfolio
Title should be not too complicated
Use the most relevant tags
Select your price wisely
Use buyer request daily (use it for sending your offers to sellers not for your advertisement)
Use social media platform for your advertisement,
You can get order in few days 🙂