You will be eligible for your first reward after 24 hours from your first trade. After the first reward, you will be paid on a monthly basis (every 30 days), but you also have the possibility to access your subsequent rewards weekly (every 7 days) or bi-weekly (every 14 days) by selecting the add-on while purchasing your challenge.
Note that to have access to your first ON DEMAND reward, you need to be at least up 3% on your account. The above only applies for Classic, No Time Limit and GOAT Evaluations.