How much time each Serial Rx buffer and RF Tx Buffer of XBee Series 2 (XB24-B) modem individually can store the data?

XBee & XBee Gateway XBee - DigiMesh
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Hi
I connected one XBee modem to my microcontroller (Intel Galileo).
This xbee modem collects data from other four XBee modems and send data to Galileo serial port…
So I want to know how much time Serial Rx buffer and RF Tx Buffer of XBee Series 2 (XB24-B) modem individually can store the data…
because my Arduino IDE script (which is running on Galileo) is trying to access this data

I am getting data from the each modules around 22 bytes every 5 seconds…(each of 4 XBee modems send data every 5 seconds )…
I need to access that data without losing any byte…

Thanks

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If you are using hardware flow control and you are using Sleeping End devices, then a parent node can store up to either 2 RF packets or 120 bytes up to 2 1/2 times the SP time frame.