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You can use following function to Get Process elapse time in minutes

GetProcTime() {
    local p=$1
    ps -eao "%C %U %c %t" | 
    awk "/$p/"'{print $4}' | 
    awk -F":" '{{a=$1*60} {b=a+$2}; if ( NF != 2 ) print b ; else print $1 }'
}

Test

root@ubuntu:/tmp# GetProcTime monit
03
root@ubuntu:/tmp# GetProcTime apache2
104
104
104
104
104
104
root@ubuntu:/tmp# GetProcTime init
460
root@ubuntu:/tmp# uptime
 15:34:56 up  7:40,  1 user,  load average: 0.00, 0.01, 0.05
root@ubuntu:/tmp# echo $(( 460 / 60 ))
7