Refresh Data under time interval

I cannot get this code to run while under this time interval.

I want it so, when a button is pressed, the data will refresh and give me a different output than before

ex.

If time interval is less than half a second, then run code

else

if time interval is greater than half a second, run alternate code

function bool = CheckSlap(hObject, eventdata, handles)

bool = 0;

tic

while toc < 0.5

refreshdata(handles.slap);

if handles.slap == 1

bool = 1;

break;

end

end

end