The timeout time for Pro/PDM is 90 minutes by default.
This can be changed by setting the environment variable in the PDM server startup script (<pdm_loadpoint>/bin/pdm_startup).
The variable is RPC_TIMEOUT in uppercase and is defined in seconds.
Add the following line to the script to set the value to 1 million seconds (11½ days):-

RPC_TIMEOUT=1000000; export RPC_TIMEOUT

If the timeout period is too small, lengthy queries (such as 'DB Check Up' or 'Search for...') may not receive a response from the Server within the timeout period, and the client session will restart the query, resulting in an infinite loop.