How long on average before your ptc account is deleted?

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If you stop doing ptc's, how long before they delete your account? I have been in active and have told my referrals that I will be but now am thinking of going back to those sites. I actually posted a discussion asking for those to whom referred me to message me, so if you are one of those people please message me. NO REFERRAL LINKS, and I AM NOT EXCHANGING REFERRALS EITHER! I hope you all have a wonderful day, by no means am I trying to be rude I just want to make my point clear.