[Mikev]

Alarm Clock ​

You decide to get up early tomorrow morning. So you get your mechanical alarm clock (with hands) because it has a very loud ring.
You set it to ring at 10 a.m. and you go to bed at 9 p.m.

How long do you sleep for?

I will post the answer below later.

 

[Wandiwa]

Spoiler

1 hour, because its a 12hr mechanism, it will go off at 10pm.

 

[Ivory]

Spoiler

One hour, as it has mechanical function.

 

[Mikev]

Spoiler

The answer is:

1 hour