Removal of Cast 3 Days After Rhinoplasty

Personally, I leave the tapes and cast on for at least 7 days. However, sometimes certain procedures are slightly different and require different care.
I can only guess why he/ she removed it so soon after your surgery since I was not your surgeon. Perhaps he/ she did not have to break your bones and felt that it was not necessary to have you covered for longer. There could be other reasons as well.
If you are still worried, you should call your surgeon and ask him/ her for explanation. Your surgeon should be able to explain why he/she did what they did.
The bottom line is that I am sure your surgeon has a good reason. If you were to ask, I am sure you would be given a very logical explanation.

I personally prefer to wait at least 5 days before I remove the cast. It takes time for your nasal bone to heal after rhinoplasty. Early removal of the cast can impact the results of the surgery. After removing my patient's cast, I place nasal tapes over his/her nose to help reduce the post-op swelling. These tapes are water resistant and they stay on for 7 to 10 days depending on the swelling.
I suggest you contact your surgeon and find out the reason for the premature cast removal. He knows your history and he can provide you the best answer. Best wishes.

Surgeons frequently place an external splint on the exterior of the nose after surgery. The splint can help preserve the operative result and also can aid in reducing swelling.
Each surgeon has his or her preference of the duration that the cast/splint remains in place. While most surgeons leave the cast on for 5-8 days, having the cast removed at three days should not pose a problem -- but, BE CAREFUL NOT TO HIT YOUR NOSE -- any trauma to your nose in the first several weeks following rhinoplasty can potentially damage the underlying structures and detract from your result.
If you have any questions, you should return to see your surgeon. He or she can reassure you that everything is progressing as it should and that your nose is fine.