About OVER_QUERY_LIMIT in Google Maps JavaScript Directions API( Client Direction API )

[xinfei sun]

for ( var i=0; i<100; i++ ){

directionsService.route( directionRequest, function ( response, status ) {

//it often get the status of OVER_QUERY_LIMIT 

});

}

if i use the setTimeout to let it slow,which is the delay time ?

I use the client Direction API(JS Direction), Not the Web Service API .