Good morning,
i would set then the Perfect in brackets. The default for key renegotiation is 3600 sec or one hour for 128 bit block ciphers, for 64 bit block ciphers OpenVPN makes a renegotiation every 64 MB of data transfer, to give you an idea of how OpenVPN wants to secure the connection in that manner.
Your value would set the renegotiation of the session key to 480 minutes = 8 hours.
Modifying the reneg-sec value is a workaround there is may a better option for this, checkout ’ –auth-token token’ and ‘–auth-gen-token’, it might be a better opinion. Haven´t set it up myself so you would need to investigate it by your own, may someone else here can go for it too…
Best,
Erik