Is it possible? Well, anything’s possible. Is it likely? Especially after 4 months without running, there is still a world of difference between 13 miles and a full marathon. It would be different if you were running 10 miles a day every day for 4 months and then did this 90-100 minute 13 miler (see the “collapse point theory” in the article GTF linked to in your last thread). Having run 0 miles a day for 4 months, the next 13 miles will be much more difficult.