Cluster of timeout related values for the state table entries
$ sudo pfctl -s timeouts tcp.first 120s tcp.opening 30s tcp.established 86400s tcp.closing 900s tcp.finwait 45s tcp.closed 90s tcp.tsdiff 30s udp.first 60s udp.single 30s udp.multiple 60s icmp.first 20s icmp.error 10s other.first 60s other.single 30s other.multiple 60s frag 30s interval 10s adaptive.start 6000 states adaptive.end 12000 states src.track 0s
you can set these individually if you know what you are doing.