there is no fixed number of days. I have also heard that someone got their first order after 4 years and for some after 2 weeks. Your job is to present you gigs and skills in an attractive and creative style to make it more appealing and you will attract a customer. These platforms are competitive, so you have to be consistent and patient. So do not lose hope, the customers will judge the quality of your work based on the quality of your profile and gigs.