How to get elapsed time in case struture?

I'm trying to get Elapsed Time VI to work but couldn't figure out how to use it properly.
I have a subVI with state machine structure to decode data stream from serial port.
State1 uses VISA read to read a byte and check if it is the Start of Frame. If TRUE, goes to State2. If FALSE, loop back to State1 and try again.
If the State1 keeps getting FALSE for certain time (e.g. 5 seconds), stop the subVI and insert custom error code.
So I have to calculate the elapsed time since State1 starts to be FALSE and keeps to be FALSE.
I tried to use Elapsed Time VI but have problem of understanding it well.
Is there any other better solution than using Elapsed Time VI? Also, how long is the execution time of Elapsed Time VI?
Any suggestion will be very much appreciated.

Hi,
The Boolean output (Time Elapsed) in Elapse Time VI should give True when time got elapsed.
Else we can simulate using "Tick Count (ms)", which counts the ticks in milisecond. You can move on to state 2 when count reaches to reauired duration.
We can give you better idea if you post the code VI.
Regards
Haneef

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I'm not sure what to do next in this program. Basically, I'm not sure exactly how to get the time to output accurately, as in what forumla I should be using.
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Well thanks to both of you. I did a little reading up on the modulus operator and coupled it with some logic (although, truthfully, I'm not really using to there actually being an application for the remainder of a division operation, since it's never really used very much in any of my Math courses) and the hours portion works perfectly now:
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