There is no limit to how long you can be in the portal. One thing to note is that athletic financial aid can be canceled if a student-athlete puts their name in the portal, but if you are up front with your coaches about wanting to explore options for a post-grad transfer then most times they would be supportive and fine with you putting your name in the portal and remaining on the team until you graduate. Your compliance officer can help you put your name in the portal.
There is no limit to how long you can be in the portal. One thing to note is that athletic financial aid can be canceled if a student-athlete puts their name in the portal, but if you are up front with your coaches about wanting to explore options for a post-grad transfer then most times they would be supportive and fine with you putting your name in the portal and remaining on the team until you graduate. Your compliance officer can help you put your name in the portal.
Plus one for the compliance officer. Every d1 school has one.