I just found the correct answer
<script type=”text/javascript”>
(function($) {
acf.add_filter(‘time_picker_args’, function( args, $field ){
args.hourMin= 7;
args.hourMax= 22;
args.stepMinute = 15;
args[‘showSecond’] = false;
return args;
});
})(jQuery);
</script>
on this site all the args name for timepicker are listed
https://trentrichardson.com/examples/timepicker/
