@bot.message_handler(commands=['start'])
def start(message):
message1 = bot.send_message(message.chat.id, 'Приветствую.')
bot.delete_message(message.chat.id, message1.id)
from time import sleep
def start(message):
message1 = bot.send_message(message.chat.id, 'Приветствую.')
sleep(30)
bot.delete_message(message.chat.id, message1.id)