by u/Improbably_wrong. Source: https://www.reddit.com/r/RequestABot/comments/7jn83k/bot_that_permits_a_user_to_submit_1_text/drg23mi/

limiter.py

import praw
import time
from datetime import datetime, timedelta

def hours_posted(submission):
    """Gets the time that passed (in hours) from when the post was made. (All time is converted to UTC)"""
    time_created = submission.created_utc
    current_time = datetime.utcnow()
    time_posted = datetime.utcfromtimestamp(time_created)
    time_difference_in_hours = (current_time - time_posted)/timedelta(hours=1)
    return time_difference_in_hours

def post_made_today_check(user, link):
    """ Returns true if the user who just posted, has already made a previous post within the past 24 hours
        Returns false otherwise"""

    reddit = praw.Reddit(client_id='',
                client_secret= '',
                user_agent='')

    subreddit = reddit.subreddit('')
    submissions = subreddit.new(limit=50) #Change limit accordingly (max 1000)

    for submission in submissions:
        if link == submission.permalink:    # Ignores the post we are checking
            continue
        #If a post has been made in the past 24 hours by the same user, return true
        if user == submission.author.name and hours_posted(submission) < 24:
            return True

    return False

if __name__ == "__main__":


    reddit = praw.Reddit(client_id='',
                    client_secret= '',
                    user_agent='',
                    username='',
                    password=''))

    subreddit = reddit.subreddit('') #Enter 
    submissions = subreddit.new(limit=50) #Change limit accordingly (max 1000)
    multi_posts_today = False

    for submission in submissions:
        multi_posts_today = post_made_today_check(submission.author.name, submission.permalink)
        if multi_posts_today == True:
            submission.reply("Enter Reply Here") #replys to post
            submission.mod.remove() #Deletes the post
        break