Calculate runtime in microseconds :
DATA: lw_t1 TYPE i,
lw_t2 TYPE i,
lw_elapsed TYPE i.
* Get the time and put in lw_t1.
GET RUN TIME FIELD lw_t1.
* Wait 3 seconds.
CALL FUNCTION 'ENQUE_SLEEP'
EXPORTING
SECONDS = 3.
* Get the time and put in lw_t2.
GET RUN TIME FIELD lw_t2.
* Calculate the different between lw_t2 and lw_t1.
lw_elapsed = lw_t2 - lw_t1. " In microseconds.
lw_elapsed = ELAPSED / 1000000. " In seconds.
* Display the runtime.
WRITE:/ ' Runtime =', lw_elapsed, 'seconds'.
If your measure may overload 36 min, do not store the run time in a type i (integer) variable.
You should use a type numeric, like :
DATA: lw_t1(200) TYPE n,