import requests
import time

start = time.strftime('%M')

r = requests.get(stream_url, stream=True) #not putting url here but it's defined

with open('6am-630am.mp3', 'wb') as f:

    try:
        while int(time.strftime('%M')) < 30: #do this till it's 6:30
            for block in r.iter_content(1024):
                f.write(block)

    except KeyboardInterrupt:
        pass