From memory, I think LineageOS 17 took roughly 8-12 hours for an initial build and 3.5 hours for subsequent (ccache) builds on an Intel i5-3570K and spinning hard drive. That's not including the initial git clone.
The idea might seem daunting, but assuming midrange hardware and a decent net connection, it's very much doable in under a day without resorting to cloud services.
The idea might seem daunting, but assuming midrange hardware and a decent net connection, it's very much doable in under a day without resorting to cloud services.