永久
えいきゅう · eikyuu · JLPT N3 · noun
eternity
⏳ 永 forever + 久 long time = lasting forever; sounds like A-queue, an endless line
永 also appears in 永遠 (eien, eternity), and 久 appears in 久しぶり (hisashiburi, long time no see). Two time words together give perpetuity. The sound hook: eikyuu is close to A-queue, a line that never ends.
久 — person 人 with a stroke marking the back
Originally a pictograph showing a person from behind with a mark indicating moxibustion treatment applied to the back, the original sense of 'cauterize' (now written 灸). It was borrowed phonetically to mean 'long time' or 'enduring,' which became its standard meaning.