How to create a "time" variable

If I was to say there was 3hrs left and you have to pick 3 choices would I word it

*if (time = 0) goto Chapter 1.1 ?

*label time_check
*if time = 0
 *goto chapter_1
*else
 *return

*label main
*gosub time_check
*choice
 *hide_reuse #Water the flowers.
  TEXT.
  *set time -1
  *goto main
 *hide_reuse #Exercise.
  TEXT.
  *set time -1
  *goto main
 *hide_reuse #Eat.
  TEXT.
  *set time -1
  *goto main
 *hide_reuse #Sleep.
  TEXT.
  *set time -1
  *goto main


*label chapter_1
TEXT
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