Hour or hours?

[howies]

Hello! I'm wondering if anyone would mind helping me with this issue hour or hours?
So, if I'm advertising two separate times for people to enquire information, let's say 8-9am and 3-4pm, should I say:
Information hour 8-9am
3-4pm

Or should I say:
Information hours 8-9am
3-4pm

I think this is something to do with quiasy possessives, but not sure!
Any help is much appreciated. Thanks!

[Alan]

'Hours', plural (but not possessive).