80
Qa9-45 Qb1-1 (388) Qb2-31 Qb2-32 Qb2-34 Qb2-35 (472)
258 40 days 299 day number 300 (= 236 + 64)

The curious sign at bottom left in Qb2-31 probably is meant to connect it with Qb1-1.

Comparing with the parallel text in H we can guess Qb1-1 could refer to Rogo:

Ha10-31 Ha10-32 Ha10-33 Ha10-34 Ha10-35 Ha10-36
no Q text here
Qb1-1 (388) Qb1-2

From day 258, where the reader has to turn the Q tablet from side a to side b, there are 6 weeks to day number 300.

Tamaiti in Qb2-31 apparently has been given a number which alludes to day 231 (where 231 + 64 = 295 = 10 lunar months from winter solstice).