Steroids use. Long term and high dose?

What is called long term and high dose steroids use? I am reading every where that people put on high dose steroids or long term steroids are at increased risk of mucormycosis. This really makes me worry. Does 15 days duration including tapering dose of methylprednisolone make it long term ? Intially started with 32 mg tapered to 16, 8 and 4 mg before stopping. Is this long term and high dose ? Also, till when should I keep worrying about mucor risk. My mother recovered from Covid last month on April 30. Currently she is taking multivitamins and metformin 500 for sugar. FBS is 101. Nobody is mentioning the specific duration post covid one should keep a track of symptoms. This uncertainty is increasing my anxiety. Till when we should be under stress. Please suggest