it's 60 days if there are no amendments. an example i can think of off the top of my head is ftnw. you can see their filing and amended filings in 2015 here.
10-12G/A Aug 19, 2015 1.4 MB PDF PDF RTF RTF HTML HTML Excel XLS NT 10-Q Aug 14, 2015 Jun 30, 2015 25.3 KB PDF PDF RTF RTF HTML HTML 10-12G/A Jun 3, 2015 423.6 KB PDF PDF RTF RTF HTML HTML Excel XLS 10-12G/A May 6, 2015 1.3 MB PDF PDF RTF RTF HTML HTML Excel XLS 10-12G Mar 17, 2015 1.3 MB PDF PDF RTF RTF HTML HTML Excel XLS