If you say that time is onyourside, or that you have time onyourside, youmeanthat you do not have to doquicklywhatever it is that youwantor have to do.
（某人）有充裕的时间We don't have to make afinaldecisiontill nextweek, so time is onourside.下星期之前我们不必作出最后的决定，因此我们有充裕的时间。