Simple Chat msg for guild recruiting.

[Nova320]

Trying to send chat message through addon when I am only and only every 20 min
code:
local flag = 1
sleep(60)
While 1 do
hour,minute = GetGameTime();
if flag == 1 or hour >= phrs+1 or minute >= pmin+11 then
SendChatMessage("Looking to do High-level keys or trying to form a raid team? Looking for help with keys? Then we are your guild", "CHANNEL", nil,2);
RunMacro("Guild");
phrs, pmin = hour, minute
flag = 2
end
end

But this does not work. Can anyone help?