The phrase "rack times" can have several different meanings depending on the context in which it is used. Some common synonyms for this phrase include "busy times," "hectic periods," "high demand periods," "peak times," or "rush hours." These terms all imply that there is a significant amount of activity or demand occurring during a particular period of time. Additionally, other synonyms for "rack times" may include phrases that are more specific to particular industries or contexts, such as "holiday rush" in retail, "tax season" in finance, or "harvest time" in agriculture. Ultimately, the precise synonym for "rack times" will depend on the specific context in which the phrase is used.