Your example is 41 characters which is 410 bits. At 115200 bps that will take about 3.6ms. The way you are formatting it 1 analog could require up to 8 characters, which would require a message up to 64 characters or 640 bits. At 115200 bps that will take about 5.5ms.
Actually the analog values are 10 bits. 1023 requires 10 bits.