What do these two sentences mean? Why has it only been a few hours?

For example, if they are talking about 20 13.6. 13.

Next, the working soldiers will go back to 35 years ago, and the task is to find IBN5 100 on 2013 and give it to the brooch, so it took them 35 years to reach 20 13.6. 13.

As for the brooch, when the immigrant soldiers returned to 35 years ago, the world line changed, but the brooch as an observer was not affected by the world line, and was directly at the time of the changed world line 20 13.6. 13. And agreed to meet with migrant workers who have experienced 35 years in a few hours to get IBN5 100.

This is the general meaning of their conversation. It may not be easy to express, but I will elaborate on what I don't understand, hoping to understand you.