Try something like this,
Code:
awk -F'[>| ]' 'BEGIN { print "Session ID Create Time Delete Time Session Length"}
{ for(i=8;i++<=NF;) if ($i~/[0-9]+[a-zA-Z]+/) {split($4 ,a,":");
if (b[$i]++==0) {d1=$2OFS$3OFS$4; s1=a[1]*3600+a[2]*60+a[3]}
if (b[$i]==3) {d2=$2OFS$3OFS$4; s2=a[1]*3600+a[2]*60+a[3];
printf"%s %s %s %s:%02d min\n", $i, d1, d2, int((s2-s1)/60), (s2-s1)%60}}}' file
