So, I just opened my tub of ultima last night and used it for the first time. I since found out-today that I have strained my back from heavy deads and a PT is advising a month off from the gym.
Will it keep for 4-6 weeks in the container?

Yep, no worries.
Might even want to throw it in a large, gallon sized zip lock bag or something to help keep out moisture.
^^^^ no that is a flat out lie... I will buy it from you lol Please I am out!!!!! I need it!!!!!!!
Diet is always the key to unlocking the door of success