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Is this what you're looking for?
awk '!len || length($1) > len {len=length($1)} END{print len}' file

Its not $1, its $0 - small change to what you have posted

awk -v l=0 'length($0)>l { l=length($0);rec=$0} END {print l," ", rec}' inputfile

Could this help you?
len=3
awk -v l=$len 'length($1)>l { l=length($1);rec=$0} END {print l," ", rec}' inputfile

Something like this?
awk -F: '{$6=$3+$4+$5;total+=$6}END{print "Total = " total}1' OFS=":" file