A non-zero value in ⎕RTL places a time limit, in seconds, for input requested via ⍞, ⎕ARBIN, and ⎕SR. ⎕RTL may be assigned any integer in the range 0 to 32767. The value in a clear workspace is 0.
⎕RTL←5 ⋄ ⍞←'FUEL QUANTITY?' ⋄ R←⍞ FUEL QUANTITY? TIMEOUT ⎕RTL←5 ⋄ ⍞←'FUEL QUANTITY?' ⋄ R←⍞