Once the foundations are in (tower and building), you can easily stack a cell tower in 1-2 days depending on height. Hanging antennas and coax are probably 3 days hung and terminated depending on how complex the arrays are. The equipment is built and often comes in turnkey. The building usually poured concrete and completely finished and delivered on site, just add power. Its a one day set easily.
We just had a 299' self supporter with close to 15 dishes with coax and waveguide built in San Antonio, and it was about 3 weeks only because of the long runs into the studio.