Router: "Huh." Amber stares at the cat. "So. You've been carrying this lump of source code since when ...?"
"At the signal, for precisely two hundred and sixteen million, four hundred and twenty-nine thousand, and fifty-two seconds," Aineko supplies, then beeps smugly. "Call it just under six years."

i. 216,429,052 seconds = 6.86 years (just under seven years).
ii. Assuming that Aineko began to "carry the source code" when he picked up Annette's alien download package at the end of Tourist, that occurred on "the eve of the third decade." The beginning of Router takes place in "the fifth decade." This seems inconsistent with six or seven years.