Both 99 and 250 are numbers we have learnt to associate with Venus.

392	102		240		4
		Cb5-9		Cb14-15
5 * 99 = 250 + 245			5 * 49 = 245

99 is the number of lunar months needed to reach 2920 days = 5 * 584 = 8 * 365 days (and 99 * 29.5 = 2920.5).

250, we have discovered, equals 314 - 64, and counting from Ga1-1 there could be a glyph which represents Venus:

Gb1-18	Gb1-19	Gb1-20 (250)	Gb1-21	Gb1-22	Gb1-23	Gb1-24	Gb1-25

In H (counting 3 glyphs per day from Ha1-4) day 250 equals glyph 750 at Hb3-6, and obviously a 'break in time' is announced at that point in the text:

			189	747
Hb9-48	Hb9-49	Hb9-50			Hb3-4	Hb3-5	Hb3-6 (753)
day 1			63	249	day 250 + 64 = 314

Friday (Venus) is the first day of the cycle. Day 314 could be its last day. There are 1296 glyphs in H and 1296 - 3 * 314 = 354 (= 12 * 29.5).