arno: I had the delay as well (even though it was only some 5 seconds or so) 
and it was caused by the harddrive (or, to be more precise, the libata driver) 
which complained about something _SSD (I don't have a SSD, don't even know if 
the error message in kernel log really referred to the solid-state-disk "SSD"). 
Anyway, I worked around the problem with libata.noacpi=1, which disables ACPI 
for the harddrive but not for the hole system. I think there was an alternative 
workaround which changed the scheduler or something, but I went with this one.
I don't have any noticable drawbacks because of that kernel switch - Hibernate 
works just fine (I use TuxOnIce BTW, a great way to reduce hibernation times) 
and everything else which is related to ACPI didn't suffer either.

So, if your kernel log says something about an SSD as well just before
the delay occurs, try this switch (or just try it instead of turning
ACPI off completely).

-- 
resume from suspend doesn't work (powers off instead) for various Acer Timeline 
laptops
https://bugs.launchpad.net/bugs/405120
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