How long can I store a hybrid mattress on its side?

I have an IKEA Hesstun mattress - it is a hybrid, with mini springs throughout the mattress, and a top layer of memory foam. I know its better to store a mattress laying flat down, but how long can I store this on its side before it gets damaged? It is standing straight up on its long side, and I have boxes/other furniture pushed against it to keep it as straight as possible. 

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