1) The length of time is simply the
time before the command is fired. It's up to you and your systems
what length that is.
2) The join number for a timer does not matter, just make sure
it's not used by anything else in your project.
3) I don't understand your question.
4) Again, I don't understand your question.
5) Yes.
Note that a repeat count of 1 means it only fires once, and 100ms
after the page is opened. Your connections might not have loaded
up then.
If it is just a status read macro, then maybe you can set it to
fire 1000ms after startup (1 second you wont even notice the
difference...) and then set it to repeat 3 times or something to
make sure the command gets sent to your system.