thanks for contacting the wefugees community.
I am not sure if I fully understand your case. If you have a dublin case, the authorities have only limited time to take you back to Italy. If they don't make it within this period, germany becomes responsible for your asylum case.
If you have a residence permission in Italy (you mentioned you have "documents" from italy), there is no such deadline for the authorities.
In both cases, I would expect the Duldung to be issued only for a short time (like 3 months, but I don't know for sure).
Please note that this is only very general information. For more detailled information about your particular case it would be helpful to go to a refugee advisor in your town or to contact me by the free App "mbeon".
My name is Ruth and I am a professional refugee advisor. In case you need a confidential consultation you can write me via the app ‘mbeon’, which provides advice for adult immigrants in Germany. Download the app at Google Play or App Store and get in touch with me or 160 other migration advisors. It's free of charge, anonymous, data secure and you can get advice in 15 different languages. Find more information here: www.mbeon.de.