This will not work. The hours are absolutely necessary. Ask your employer to write the letter again. Alternatively, you could show pay slips showing the hours worked, but a new letter is easier.
I'm in a similar situation. My employer says it's against company policy to put salary and number of work hours on the reference letter.
I'm planning to include my pay stubs, bank statements and offer letter to prove that I was paid. However unfortunately, none of these document mention my work hours I guess I'll just write a letter of explanation for it.
This will not work. The hours are absolutely necessary. Ask your employer to write the letter again. Alternatively, you could show pay slips showing the hours worked, but a new letter is easier.