There are various interchangeable words and phrases that can be used instead of "what time" to ask about the hour or moment something is taking place. For instance, you could say "when," "what hour," or "at what moment." "When" can be used in a less formal context, whereas "what hour" sounds more formal. On the other hand, "at what moment" implies specificity and precision in time. Other phrases that can be used include "what's the ETA," "when can I expect," and "at what time can I anticipate." Overall, there are various synonyms available that can be used to ask about the time of day or specific moment.