An Hour Or A Hour
The numerical forms would be 1 1 2 hours or 1 5 hours.
An hour or a hour. Just make sure that when you pick one you apply the correct rules. There are 60 minutes in an hour and 24 hours in a day. This is because the pronunciation begins with yu a consonant sound. In the first instance hours is plural because we are talking about more than one hour.
If a word begins with a vowel sound then the correct article is an. In short you can use all of the variations below. Also abbreviated hr is a unit of time conventionally reckoned as 1 24 of a day and scientifically reckoned as 3 599 3 601 seconds depending on conditions. Because hour is typically pronounced with a silent h an hour is correct.
Use an if it starts with a vowel sound. You should say a union even if union begins with a u. Otherwise if it begins with a consonantal sound the correct article is a. In the second example hour is singular.