Religious accommodations seem to be taking longer than medical accommodations. For a medical accommodation, HR will either provide a form for the doctor’s office, or if you are providing a doctor’s note, they will call and verify with the doctor’s office. Medical accommodations are reviewed every 3 months.
Religious accommodations go through ER as opposed to HR. An ER consultant conducts a meeting, and asks questions to essentially verify the sincerity of the religious belief(s). If the ER consultant determines it is sincerely held, it then goes up the chain for approval. This is where it seems to slow down. The ER consultant needs to obtain approval on their side, and also talks to your manager to determine if the requested accommodation is feasible. Even then, the actual approval seems to be taking some time. For example, for a request submitted at the beginning of December, and then accommodation agreed upon with manager by the end of December, there is still no official approval as of today. The ER consultant is also unresponsive to emails and Skype messages.
One thing to keep in mind is that if an accommodation is still pending, the employee can continue to work from home.