sleep 2.5;

[download]
works if you 
use Time::HiRes qw/sleep/;

[download]

The alternative 

select(undef, undef, undef, 2.5);

[download]
looks too much like a hack and isn't very clear.

/J

Update: I can't believe I didn't scroll down to see the existing answers to this question :)

In reply to Re^2: Perl oddities by jplindstrom
in thread Perl oddities by brian_d_foy

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