You can also use schedule_function to run the code every 30 minutes. It will be smart enough not to run the function if it's the end of day. Here's an example:
# For every minute available (max is 6 hours and 30 minutes)
total_minutes = 6*60 + 30
for i in range(total_minutes):
# Every 30 minutes run schedule
if i % 30 == 0:
# This will start at 9:31AM and will run every 30 minutes
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