MessageExpired because of large amount of data

Hi Experts, i need some advice for my following scenario.

I have a 50000 data that need to be inserted into SAP R3 HR. I am using BPM when calling the RFC dan using a sync message to get the response from the RFC. However, i think because of the large amount of data, i get the error "MessageExpired" in my monitoring.

After i read some documentation, i find that a sync message has a timeout period (xiadapter.inbound.timeout.default = 180000 [ms] ) . My question is, if the 180000ms is not enough for the RFC to process the whole 50000 data, i can increase the timeout time, am i right? But then, to what maximum value will be the most appropriate for me to set the timeout value so that it will not effect the performance of XI. Anyway, does increasing the timeout value effect anything at all?

Need the advice and inputs from you experts...Thank you so much in advance...