How many times can HyperJuice USB-C 27000mah charge my devices (i.e: iPhone, MacBook, Other Laptop)?

This depends on how large is the battery size on the devices you are charging.

The HyperJuice USB-C is 27000mAh (100Wh), not accounting for power loss during power transfer.

Example:

The iPhone X has 10.35Wh battery  (Can be charged about 8-9  times )

MacBook Pro 2018 has an 83.6Wh battery ( Can be chargedd 1 time) 

Information on the size of the battery on your device can be found by looking at your device manufacturer's official product page or by contacting them.