I have few blogs - got banned by adsensegot a back-up account - when is it safe (if ever) to put the adsense back on the blogs with the new account ?
never safe once you're banned. you can trick google adsense application, but they always catch up with you sooner or later. Live in constant fear that your account will be banned again.
yes it's not guaranteed. ok you're back in, but do you already got your first payment on this new account? If not, then nothing is won.