how long will cat 6 cable survive outside if it is not an external grade cable.
No sunlight touches the cable but only cold temperatures of around -10c, everyday every year.
the cable has no holes, and it is above ground level flat on a wall.
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Indoor UTP cabling cannot withstand moisture. It may seem like the sheath is waterproof, but it is not. Water changes the dielectric properties of the cable. If your business depends on the network, then it really needs to spend some money to do it correctly.
Outside cabling is also subject to stricter regulation, e.g. it cannot extend more than 50 feet into a building, and it must have proper grounding, bonding, and lightning protection, etc. Doing something like you describe can get the building red-tagged for occupation until the situation is corrected, and it can lead to fines for every day it is out of compliance. There can also be stiff civil and criminal liabilities in the event of a disaster, like a fire.