Consider a computer network that uses Kerberos to authenticate users to resources. When a user logs into a workstation using her name and password, the workstation derives the user's long$-$term key and obtains a ticket granting ticket from the Key Distribution Center. Immediately after that, the user's workstation deletes the user's password and long$-$term key from memory.

Why is it important that the workstation minimizes the amount of time it has the user's password and long$-$term key in memory? $($Please be as detailed as you can. Your answer should compare the attack cases when those are not deleted from memory and when they are deleted from memory$).$