What is another word for when will?
Pronunciation: [wˌɛn wˈɪl] (IPA) 
"When will" is a commonly used phrase that expresses a sense of time-based curiosity. There are several synonyms for this phrase that can be used interchangeably. The phrase "at what time" can replace "when will" in many instances. "At what hour" is also a suitable alternative, particularly when referring to a specific time of day. Other synonyms include "what time," "at what point," and "whenever." Depending on the context, phrases such as "at what juncture," "during what period," and "at what moment" may also be suitable replacements. Ultimately, the choice of synonym depends on the specific situation and desired tone.
