Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# timeout

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.