140 days (equal to the number of glyphs before Ga1-29 and beyond Gb5-5) is a number which appears to be significant also in the Tahua text:

Ab4-29	Ab4-30	Ab4-31	Ab4-32
Ab4-33	Ab4-34	Ab4-35	Ab4-36 (280)

24 * 28 = 672 glyphs beyond Ab4-36 there is a pair of rima aueue glyphs:

670
	Aa4-36	Aa4-37
672 = 24 * 28