How long does an ERC take?

I'm quite curious about the duration of an ERC process. Could you elaborate on that for me? I've heard that it involves a series of steps and approvals, but I'm not quite sure how long it typically takes from start to finish. Is it a matter of hours, days, or even weeks? And what factors usually determine the length of this process? Your insight would be greatly appreciated as I'm considering embarking on an ERC journey soon.