How fast is analogRead() on the ESP8266?

AnĀ analogRead() call on the ESP8266 takes about 90-100 microseconds.

I tested this experimentally using a Wemos D1 Mini board, PlatformIO and this code:

uint32_t t0 = micros();
for (size_t i = 0; i < 1000; i++)
uint32_t t1 = micros();
Serial.print("1000 analogRead() calls took [us]: ");


1000 analogRead() calls took [us]: 97168

Since 1000 analogRead() calls (including some overhead from the loop) took 97.168ms, one analogRead() call takes about 97.168us (+-0.02us).