On time delay

[Frankg]

Hi.

i don't figure out the soulution for a on delay script. 
so i would appreciate some guidance here 

task:
if value is higher than 10 for a constant 1800 sekonds then it send true signal.


if 10 > (spjeldvinkel_setpoint * spjeldvinkel_feedback / 100) then
  grp.write('14/2/1', true)
else 
  grp.write('14/2/1', false)


- Frank