Bot to only allow posts to exist for 15 minutes

bot.py

import datetime
import praw
import traceback
import sys


BOT_USERNAME      = 'BOT_USERNAME'
BOT_PASSWORD      = 'BOT_PASSWORD'
BOT_CLIENT_ID     = 'BOT_CLIENT_ID'
BOT_CLIENT_SECRET = 'BOT_CLIENT_SECRET'
BOT_USER_AGENT    = 'BOT_USER_AGENT'
SUBREDDIT         = 'SUBREDDIT'
TIME_LIMIT        = 15

reddit = praw.Reddit(username=BOT_USERNAME,
                     password=BOT_PASSWORD,
                     client_id=BOT_CLIENT_ID,
                     client_secret=BOT_CLIENT_SECRET,
                     user_agent=BOT_USER_AGENT)

def run():
    for submission in reddit.subreddit(SUBREDDIT).submissions():
      if time_diff_in_seconds(submssion) > seconds(TIME_LIMIT):
        submission.mod.remove()
      
def time_diff_in_seconds(submission):
    submission_time = datetime.datetime.utcfromtimestamp(submission.created_utc)
    current_time = datetime.datetime.utcnow()
    
    return (current_time - submission_time).seconds
      
def seconds(number):
    return number * 60
      
if __name__ == '__main__':
    try:
        run()
        sleep(30)
    except KeyboardInterrupt:
        sys.exit(0)
    except Exception:
        traceback.print_exc()