QuecOpen SKD for BC660K-GL minimum wake duration

I have been working on BC660K-GL with QuecOpen SDK for a while and the RTC works fine to wake up from deep sleep and re-enter deep sleep. I noticed the minimum wake duration is ~10 seconds, even if I do not enable the RF.

The module is battery powered so I am trying to save as much power as possible. I set the RTC to wake the modem up to do a small task and then let it to go back to deep sleep. Is there any way to reduce the wake time so that the modem can enter deep sleep quickly?

Thanks!