The phrase "time on hands" typically means having free time or being idle. Its antonyms include the phrases "busy schedule," "hectic routine," and "packed itinerary." These antonyms denote a state of being occupied or having a full slate of activities with no free time. Another antonym could be "productivity," which suggests a focus on completing tasks efficiently and effectively, rather than having time to spare. Finally, "urgency" could be an antonym, as it denotes a sense of pressure or importance that requires immediate attention, leaving no time for idleness. In short, the antonyms for "time on hands" refer to a state of being busy and engaged, rather than having excess free time.