Well first off you should scout around the area during the spring to see if the turkeys are still using it. They could be long gone from when you heard them in deer season.
BUT if you know they are in the area I like to at least wait 30 minutes after my last calls before I move. A lot depends on your area. If you know the turkey could be moving thru on thier own then it may pay to sit a little longer. If you are in an area where they could be anywhere some people like to keep moving until they get a response. A lot of times a bird may hear you off the roost but be henned up. Later in the morning the hens will go to nest and he'll start looking again.