Copied from USCIS:
Beginning Sept. 4, 2021, USCIS is extending the time that receipt notices can be utilized to indicate proof of standing from 18 months to 24 months for petitioners who correctly file Kind I-751, Petition to Take away Situations on Residence, or Kind I-829, Petition by Investor to Take away Situations on Everlasting Resident Standing. We’re making the change from 18 to 24 months to accommodate present processing instances for Kind I-751 and Kind I-829, which have elevated over the previous 12 months.
Conditional everlasting residents who correctly file Kind I-751 or Kind I-829 will obtain a receipt discover that may be introduced with their Kind I-551, Everlasting Resident Card (often known as a Inexperienced Card), as proof of continued standing for as much as 24 months previous the expiration date on their Inexperienced Card, whereas their case stays pending with USCIS.
Moreover, we are going to problem new receipt notices to eligible conditional everlasting residents who correctly filed their Kind I-751 or Kind I-829 earlier than Sept. 4 and whose instances are nonetheless pending. These receipt notices may also function proof of continued standing for twenty-four months previous the expiration date on their Inexperienced Card.
As a reminder, conditional everlasting residents who plan to be outdoors of the USA for a 12 months or extra ought to apply for a reentry allow by submitting Kind I-131, Software for Journey Doc, earlier than leaving the nation. For extra data on Worldwide Journey as a Everlasting Resident, see our Inexperienced Card web page.