Using the same data you had example, I got the following:

nawk 'BEGIN {RS=FS=""} {print $1, NF-1}' data.txt
0 27
0 31

Adding space to ""

$ nawk 'BEGIN {RS=FS=" "} {print $1, NF-1}' data.txt
01.02.09 0
08:30 4
07:00 4

Changing to NF-2

$ nawk 'BEGIN {RS=FS=" "} {print $1, NF-2}' data.txt
01.02.09 -1
08:30 3
07:00 3