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I'm certainly no expert, but as I understand it there's no limit to how many you can send. So, the sooner you get started the better. Only cost you a stamp.
Good luck!
I would start ASAP. You have nothing to lose. Even if your request is denied, you could try again in a year.
I have a 4 year old paid collection from Comcast that is with ERC. They were quite adament that they do not dow GW removals. Maybe you will have better luck with them.