I just checked the uptime of my ESXi server. Damn, that's like 6 years.
I'm starting to look into migrating to Proxmox, I want to build a cluster. Trying to see if I can get nested Proxmox working on ESXi as a temp solution until I buy hardware to do a proper cluster, then start to migrate stuff off ESXi. Having issues with VT-D passthrough though... it might not be supported. I can still run VMs in proxmox with KVM virtualization disabled but performance is quite bad.
Once I have a clustered setup at least I can reboot hosts once in a while so I can do hypervisor upgrades.