[ecasound] ecsound recording time

when I record a 2 hour session with
/usr/bin/ecasound -D -t:7200 -f:32,2,48000 -i alsa,ice_spdif -o "x.wav"
the recorded file shows 120 min. length in audacity,
but it is about 6 minutes shorter then the requested 120 minutes.
I use a M-Audio 2496 with spdif-in, which has 48000 fixed.

in .asoundrc :
# spdif input with standard sample-rate 48000
pcm.ice_spdif {
        type plug
        ttable.0.8 1
        ttable.1.9 1
        slave.pcm ice1712
}

What can I do besides computing overlength recording times ?

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