People with endometriosis, or know someone or know about the illness itself, how long does it take for stages to advance?

My doctor clinically diagnosed me with endometriosis. I had to wait a few more years for surgery (due to certain reasons). However, I'm curious how long it takes stages to advance? I'm very concerned about the fertility issues and worried I'm on a timeline. I have only been in extreme pain for about four years. So at some stage (maybe when still now) I'm at stage one? I'm just curious how long it takes. Does the stages change quickly? Please help
People with endometriosis, or know someone or know about the illness itself, how long does it take for stages to advance?
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