SNZB-02LD temperature refresh frequency on ZB Ultra / eWeLink?

Hello,

I recently added two SONOFF SNZB-02LD sensors, and they are actually working very well.

My gateway is a ZB Ultra.

I have a question regarding the temperature refresh/update frequency in the eWeLink app.

How often does the ZB Ultra poll/query Zigbee devices and update their values in the application?

I often notice a temperature difference of more than 1°C between the value displayed locally on the device itself and the temperature shown in eWeLink.

Is it possible to force a manual refresh/update of a device?

Could you also explain how the update algorithm works?
For example, is the update triggered by a fixed time interval, by a temperature change threshold, or by another mechanism?

Thank you.