min_ttl does not have effect

[my name]

Hello, i use maradns ver 1.3.07.08 as a recursive dns

It works fine but, it seems it doesn't honour the min_ttl.
I specified min_ttl = 72000 on mararc.
But, when for instance i go to somewhere.com, then close and clear the
browser cache, open the browser again, and then go to somewhere.com
again, the browser takes some time doing the lookup again.

Here's is my /etc/mararc :

ipv4_bind_addresses = "192.168.1.1"
chroot_dir = "/etc/maradns"
recursive_acl = "192.168.1.0/24"
timeout_seconds = 7
maximum_cache_elements = 4096
min_ttl = 72000
upstream_servers = {}
upstream_servers["."] = "208.67.222.222,  208.67.220.220"

my /etc/resolv.conf already pointed to 192.168.1.1.

Any idea ?
Thank You :)