Recording duration (s) of 10sec, records for 9 sec

I configured a bank of 8 AM last night using Firmware 1.4.3 and config app 1.3.4 with:

• Sleep duration (s) : 1

• Recording duration (s) : 10

As expected this recorded onto the Sandisc Extremes a file every 11 secs right through the night without fail on all the AM.

However every file recorded is actually 9 secs long. Is this?

• A bug in config App or firmware?

• A oddity of writing to the Sd cards with such a small sleep?

• A "design feature" to prevent small sleep settings?

Perhaps this is fixed in Config App. 1.3.5?? 😉