Its possible to install OS for 50 machines at a time. We can use three ways.

1) WDS (Windows Deployment Service)

2) RIS (Remote Installation Service)

3) Ghost imaging.

In WDS, first we need to caputure the image of OS into the sever. Then confirm all machines should be connected with LAN.

RIS also maintains the procedures like WDS.

In ghosting we need to take the image of client OS into particular HDD. By using that source HDD, we can easily install the os into all the machines. This is very easy way.