What is the longest hours i can wear my soft contact lenses for?

Okay so my soft contact lenses is called UltraFlex™toric.

Just wondering, how long can i have them in my eyes?

I have like 7-14 hours of school so i have to keep them in or else i won't be able to see.

Also, if you had never heard of that brand then, how long can most soft lenses stay in your eyes?

Thanks you.

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