Robux come from developers who provide games. Roblox pays a very low rate for exchange the Robux. So they prefer to give them to users like you instead of exchanging them for real money on Roblox.
Of course not. Many users will scare you by saying that you will be banned for receiving Robux from third parties, but this only happens if you buy Robux illegally from a prohibited source. Our Robux come from legal games by Roblox developers.
It usually takes 3-7 days once you have completed the Robux withdrawal period on the website. You just need to wait for Roblox to release your Robux.