[Grammar] "working hours is" vs "working hours are"?

[hampeh]

Hi, I’ve been reading about labor laws here and found something interesting in the comment section. I was wondering which of these sentences are correct and which are wrong?

1. My working hours is from 8 am to 6 pm
2. My working hours are from 9am to 8pm

Thanks

 

[Barb_D]

What do you think?

 

[bhaisahab]

Fill in the gaps:
"My working hours ......... from 8am to 6pm."
"My working day ......... from 8 am to 6pm."