It is time for having supper.这句话为什么不对?

网友回答

It is time for supper/lunch.
这就是固定说法.仅从语法上看,你上面那句话是对的.但是让老外看It is time for having supper这句话,就好比老外问中国人：你吃喝饭了没啊?
======以下答案可供参考======
供参考答案1:
因为having多余
应该是 It is time for supper.或
It is time to have supper.