Visiting Grand Canyon Glass Bridge Only

HI
Will be visiting Zhangjiajie National Park soon in September and found out about this glass bridge. Due to time constrain, I can only visit the glass bridge and to my understanding , you can only visit after 4pm. My question is will it be so crowded during these period as I read about queuing for hours just to get the bridge as I need to get back to Zhangjiajie city after the visit?

Thanks.

Ben