question about the micro coaxial cable in CST

I simulate a micro coaxial cable ,but it always show a waring message,

the content is "The current seeting will propably lead to a long very long
simulation time".

I don't know how to seeting the parameter for my coaxial cable, and can
let the simulation time to be right.

I post my file to here,hope anyone can help me.

Thanks everyone

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