Here are some good basic guidelines and tips.
There really is no limitation on total LAN cable length in a network. The distance limitation is between devices that generate the signal. This is typically 100M for copper.
You really should use a structured system for connectivity rather than point-to-point patch cables. But for copper, the maximum distance for most applications is 100m for the entire channel. The different lengths of solid (fixed cabling) and stranded (patch cords) can not exceed 100m.
— Carrie Higbie