If the timer is currently on, the "onfor" value will be a unix timestamp indicating when the timer was last started. The timer value (600 in your example) indicates the number of seconds that the timer has counted prior to the most recent start. So, to get the running total you need to add the two. Like:
Total elapsed time so far = timer+(now-onfor)
Thanks for pointing this out. We will update the documentation to make this more clear.
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