I have heard about 10 years for Teflon hoses too.
But for engine hoses we are assuming the following so far: if engine (let's say Lycoming O-235-xxx) was overhauled at least once, then it doesn't have "Cessna installed hoses" any more. During the overhaul, engine hoses to be changed in accordance with Mandatory Replacement Parts SIL or Engine Overhaul Manual or something like this.
By the way, Cessna AMM asks to follow Lycoming/TCM manuals about their hoses.
In this case, engine should come with new hoses after the overhaul... is it really so ? If no, then how the hell "Lycoming installed hoses" can appear ?