3 ms·
There is bare metal code that almost immediately starts after powering the Pi on. A Pi3 and below with an absolute minimal Linux based OS could probably boot in
by dividuum 5y ago
There is bare metal code that almost immediately starts after powering the Pi on. A Pi3 and below with an absolute minimal Linux based OS could probably boot in 3-4 seconds or so. With the Pi4 that has changed and the EEPROM can take a few seconds on its own before the Pi even gets to the kernel loading phase.
TL;DR: no.