What's it doing?
Booting OS, programming FPGAs, negotiating IP via DHCP, calibration and self test.
Depending on what "standby" means, it may need to do everything but boot the OS. The start time could go from 45 seconds to 25 seconds. Programming FPGAs and DHCP are certainly not instantaneous operations.
You could get rid of almost all but DHCP by using an embedded system, analog calibration, and ASICs. But that's high-risk and expensive. Time to market for Linux/Android systems with established UI conventions, FPGAs which can be reconfigured, and digital calibration/self-test to ensure long-term accuracy/stability has huge advantages for manufacturers (cost/risk) and for consumers (price/features).