Longs you have access to the loadup of hlds or however your running it.
Example of mine:
-dll addons/metamod/dlls/metamod.dll -num_edicts
1928
For me that allows 2048 entities

Each player slot creates 15 additional edicts.
So for a 16 slot server you'd set -num_edicts 1808, unless you want to go beyond 2048 which you can.
Regards,
Orang
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