Unfortunately, commercial leases are usually written to favor the landlord, so time frames as long as six months are not uncommon.
Note to self: that's why business interruption insurance can be such a handy way of stemming the "red ink" tide should a major disaster--like a flood--occur and disrupt your business.
Review your lease terms with a real estate attorney to determine your options.
Nina L. Kaufman, Esq. is an award-winning New York City attorney, edutainer and author. Under her Ask The Business Lawyer brand, she reaches thousands of entrepreneurs and small business owners with her legal services, professional speaking, information products, and LexAppeal weekly ezine. She also writes the Making It Legal blog.