There are several synonyms for the phrase "losing time" which can help to spice up your vocabulary. For example, you could use the expression "squandering time" to convey the idea of someone wasting valuable hours that could be better spent on more productive pursuits. Another option is the term "frittering away time," which suggests that someone is idling away the day in a nonchalant manner. You could also consider using the phrase "misusing time," which faces the implication that someone is not making the most of each passing moment. Ultimately, by using variations on the phrase "losing time," you can add depth and richness to your language and express yourself in more nuanced ways.