מָתַי (mâthaymaw-thah'eeadverbwhen)
[Heb] מָתַי ETCBC: מָתַי‎ (inrg|when) OSHL: m.ed.aa TWOT: 1266 GK: H5503
Derivation: from an unused root meaning to extend;
Strong's: properly, extent (of time); but used only adverbially (especially with other particle prefixes), when (either relative or interrogative)
KJV: long, when.