Here are a few articles discussing the reasoning for tapering schedules.

"How to taper GC: The intuitive reasoning behind rapid tapering is to reduce possible GC-related side effects. However, disease flares occur more frequently when a rapid dose reduction is used, although spontaneous disease flares can occur independently of GC dose. The general view is that 10 mg prednisone equivalent daily should be reached within 6–8 weeks, followed by tapering at a rate of about 1 mg/month. Shorter tapering schedules have been proposed, which permit to reduce prednisone from 12.5 mg daily to nil in 7 months. The baseline risk profile mentioned above should be taken into account when the tapering regimen is tailored. The main question is if rapid tapering, apart from the obvious disadvantage to the patient due to the increased number of relapses, corresponds to a lower cumulative dosage or not."
--- Steroid schedules in PMR: https://academic.oup.com/rheumatology/article/53/suppl_2/i6/1819999

--- Prednisone withdrawal: Why taper down slowly?: https://www.mayoclinic.org/prednisone-withdrawal/expert-answers/faq-20057923

"What is the best prednisone taper schedule?
Some typical recommendations for prednisone tapering include:
- Dosages above 40 milligrams (mg) per day: Decrease by 5 mg at a time until you reach 20 mg per day.
- Dosages of 20 mg: Decrease in 2.5-mg increments until you reach 10 mg per day.
- Dosages of 10 mg: Decrease in 1-mg increments."
--- How to Avoid Prednisone Withdrawal: https://www.verywellhealth.com/does-prednisone-tapering-minimize-withdrawal-190242

My doctor started me on 15mg prednisone for 14 days with a prescription to fill of 12.5 in two weeks. Waay too soon. I tried it and had to go back up for two more weeks. I then went to 12.5 successfully and where I am now for 30 days total. The next rx will be for 2mg pills in order to taper to 11.5.
I would look into tapering soon to be honest. Corticosteroids are to reset the inflammation and it shouldn't take a year in most cases.