Generally, you have three years from the date of the accident to bring a lawsuit in Massachusetts for injuries sustained in a slip and fall, or trip and fall accident. There are exceptions however, such as a two year statute of limitations for claims stemming from injuries on MBTA property.
Also, if you live in Massachusetts and your slip and fall accident was in a different state, then that state's laws apply. Not all states have a three year statute of limitations like Massachusetts does.