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n=split($i,a,":") for field 0:29:0:0:0:0 results in

n=6 # 6 elements from string '0:29:0:0:0:0' separated by ':'
a[1]=0
a[2]=29
a[3]=0
a[4]=0
a[5]=0
a[6]=0
'j' is just a temporary iterator...

sorry, a tiny boo-boo:

{
f=0
for(i=4;i<=NF;i++) {
n=split($i,a,":")
s=0
for(j=1;j<n;j++) s+=a[j]
if (s>=8)
...

for(j=1;j<=n;j++) s+=a[j]

ah, ok:

{
f=0
for(i=4;i<=NF;i++) {
n=split($i,a,":")
s=0
for(j=1;j<n;j++) s+=a[j]
if (s>=8) f++
}
}
f==(NF-4)

awk -f path.awk myInputFile where path.awk is:

{
f=0
for(i=4;i<=NF;i++) {
n=split($i,a,":")
s=0
for(j=1;j<n;j++) s+=a[j]
if (s>=8) {
f++
break
}
}...