Try

lcTime2 = '09:25:16'
lcTime1 = '09:02:45'
lnSeconds = CTOT(lcTime2) - CTOT(lcTime1)
? TRANSFORM(RIGHT(TTOC( DTOT(DATE()) + lnSeconds,1),6), "@R 99:99:99")

It will work as long as lnSeconds < 86400. If lnSeconds >= 86400 see Re: Datetime variation in HH:MM:SS Message #698240.

>What I want is to substract them and convert that result in minutes\seconds format.
>
>I've tried this (CTOT('09:25:16') - CTOT('09:02:45'))/60) but in the most cases the result is a fraction that I don´t know hopw to convert to seconds.
>
>Any idea?