would like to use match limit

[Brent Clark <bclark@eccotours.co.za>]

Hey all

I have the following last four rules in my ruleset.

4863  234K REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0    
       reject-with icmp-port-unreachable
1800 86165 REJECT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0    
       reject-with icmp-port-unreachable
0     0 REJECT     0    --  *      *       0.0.0.0/0            0.0.0.0/0       
    reject-with icmp-host-unreachable
0     0 REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0       
    reject-with tcp-reset


What I was thinking / or hoping to add was the match limit, where by ill match these rules for a certain period, but 
then after that it moves to my default policy, which is DROP.
The question is, would this be a good feasable solution, and b) what would be a 
good time period (how much burst).

Thanks to those who reply in advance.

Kind Regards
Brent Clark