Re: interval type

Is their a way to add differently defined interval types ? The manual says no but I am looking for a work around. I have variable in my table defined as interval hour to second, then in my 4gl report section I define calltotal as interval hour(5) to second. I would then like to do let calltotal = calltotal + rpt.callDuration However I get a runtime error of FORMS statement error number -1266. Intervals or Datetimes are incompatible for the operation. Can I convert some how ? Now I can avoid all of this if I use the sum() function. However how can I format the output to show a greater precision in the hour qualifier ? I would like to do print column 1, sum(rpt.callDuration) // some formatting but this yeilds overflow.