barley wine yeast question

[Will Smith]

I am going to make a 15L batch of barley wine with a target og of 1.108. I am going to use mangrove jacks m42 new world strong ale yeast which is suitable for that strength but i presume i will still need to pitch 2 packets for such a high og?
thanks

 

[AZCoolerBrewer]

I pitch one pack for my big beers in 2 gallons, which the calculators say is a little short depending on the calculator and what you put into the calculator, so I would say that pitching two packs is a good call.