Ususally if swelling is there then the first 24-48 hours u should/could ice it. After that, then do nothing. The nose is gonna heal at it's own pace. I have never put heat on my nose. And don't blow ur nose!

If it's broke & swollen, it will take a lil while to start feelin right. If it's bruised & swollen u will be ready to roll soon enough. There's no set time on the healing process. I would suggest to take a few days off from sparring to give it a "break". << not meant to be a corny a** joke. Good luck.