technical question

[Norman Silverstone]

For a number of administration actions it is necessary for me to enter a
password. Once this has been done this entry remains in force for some
time before I am required to enter the password again. Can someone
please tell me how long this delay is or, if it is machine dependant,
how do I find out other than by trial and error? I want to carry out
some tests and it is important for me to know this timing fairly
accurately.

Thanks in advance

Norman