For example, when talking/writting to someone about when I'm available.
This week I'll be available on Friday from 5PM to 6PM.
I know it's not a very wide/range range/lapse but...blahblah
1) What's the correct way to express "very wide/range/lapse" when talking about time?
2) The same but saying that it's small instead of saying it's not large.
3) Are there commonly used expressions to say the same both in formal and informal contexts?