- Are you noticing anything that makes you believe the router is becoming unstable with uptime, or is this proactive behavior?
- Like @rj-45 why do you think you need to reboot everyday?
The longest uptime on a OpenWrt router I recall recording was ~124 days. I've never experienced a crash or loss of stability.
Virtual routers, have even longer uptime.
In more professional-commercial settings, I have routers that have 5+ years uptime...so I agree with @Hegabo, this constant rebooting - if warranted, should probably be inspected for a bug.