If you are into manufacturing activity then in my view, half an hour lunch break and one ten minutes' tea break should be in line with largely followed industrial practice.
15th December 2018 From India, Mumbai
Since you are in Service industry, you may follow half an hour lunch/dinner break and two ten minutes' tea breaks. It would be better if staggered timings are observed so that service is not affected .
18th December 2018 From India, Mumbai