Doesn’t matter it’s your part of job but your main Destination is the place where you work for 14 days not Mumbai.
According to Ayatullah Sistani
Who is a Kasir al-Safar (frequent traveler)?
Answer: One who travels for ten days in a month and sixty days in six months, he is considered a frequent traveler. Therefore, he should offer complete prayers and observe fast.
This will be applied for your work place not for Mumbai.