1. I don’t know, one needs to check the useful data rate of SDCCH channel per block. One burst is about 110 bits, so 1 block is about 440 bits. 1 character is 8 bits… so you’ll need about 3 SDCCH blocks to send 160 characters.
2. 47×4.615 msec to send the second SDCCH BLOCK and so on == correct
it is a “long” time for a processor, but that’s the way it works. For a human user, this extremely short time is not perceived…
Ain’t we human after all ? 🙂