Artificial intelligent assistant

to-when

to-ˈwhen, interrog. adv. Obs.
  [f. to prep. + when.]
  Until what time? How long?

a 1300 E.E. Psalter iv. 3 Mennes sones, towhen ofe herte vn-meke? Whi loue yhe fantom, and lighinge seke? Ibid. lxxxviii. 45 Towhen, laverd, turnes tou in ende, at laste? Als fire sal bren þi wreth faste?

Oxford English Dictionary

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