The start up time for the MAX8840 LDO is approximately 100 micro-seconds. This is a typical number, and is not characterized or specified in the product datasheet electrical characteristics table.
MAX8840
Production
The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-dropout
(LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regulators...
Datasheet
MAX8840 on Analog.com
The start up time for the MAX8840 LDO is approximately 100 micro-seconds. This is a typical number, and is not characterized or specified in the product datasheet electrical characteristics table.