Ah! That's what the OP meant. Unfortunately, there's a bug in your formula.

It displays the first $msg_time messages for $num_msgs seconds.
It should display the $num_msgs messages for $msg_time seconds.

Fixed: 

my @message = (
    "Message 1",
    "Message 2",
    "Message 3",
    "Message 4",
    "Message 5",
    "Message 6",
    "Message 7",
    "Message 8",
    "Message 9",
    "Message 10",
);

my $msg_time = 5;

print $message[ time / $msg_time % @message ], "\n";

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In reply to Re^2: display stuff based on systemclock by ikegami
in thread display stuff based on systemclock by Wire64

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