make up

[thomas615]

Are these sentences correct? I am not sure if I have used the word "missing" correctly.

I will work from 9 a.m. to 3 p.m. on Monday without my lunch. To make up the missing one hour, I will work extra an hour today and tomorrow.

[tedmc]

I would not use "missing".
How about: I will work from 9 a.m. to 3 p.m. through lunch on Monday. To make up for the one-hour shortfall, I will work longer today and tomorrow,

[Barb_D]

I don't understand the math.
Are you missing one hour or two on Monday?
If you are working an extra hour today and tomorrow, that's two hours.

Monday I must leave at 3. I will work through lunch, and will make up the two hours by working an extra hour each today and tomorrow.

[thomas615]

You are right. Sorry for the typo. I meant "extra half an hour" today and tomorrow. Thank you

[probus]

There is nothing wrong with missing, but the "one" is unnatural. "To make up the missing hour" is natural. "To make up the missing half-hour" is also natural.