Can I add a time limit to markers - Google Maps API

I don't know google maps API has that function included. But you can simulate marker by creating your custom overlay that looks like a marker (https://developers.google.com/maps/documentation/javascript/overlays?csw=1).

I think there are way you can set time limit using javascript or Jquery. You might have write a function to that show and hide markers. Have the javascript setTimeout( function name, time) or use anonymous function with codes in it.

ex. => window.setTimeout( function, delay);

Jquery might be simpler solution where can do work with a combination of using $('.marker') concatenated with fadeIn( ) and fadeOut, show( ) and hide( ).

Something like => var myTimeoutMarker = $('#map_canvas img[src*="a_marker_icon"][class!="timeoutMarker"]').fadeOut(5000); //Fades out in 5 seconds.

I hope this can at least give you some lead or possible strategy that may work. Good luck.