When it comes to finding synonyms for "time to burn," there are plenty of options to choose from. One common alternative is "spare time," which refers to free time that can be used for leisurely activities. Another similar term is "idle time," which implies a lack of productivity or purpose. Additionally, "unoccupied time" and "leisure hours" are two other synonyms that can be used to refer to free time that isn't being used for work or other obligations. Alternately, more colloquial options might include "downtime," "me time," or "chill time." Ultimately, the best synonym for "time to burn" will depend on the context in which it's being used and the specific connotations the speaker or writer wants to convey.