We have some hot data for you, which you only can get here, in Botan channel.
Have you thought about whether your bot’s retention is high or low, compared to other bots?
Here is the answer: the average D7 retention for bots is 9%, which means that 9% of users send a message to the bot seven days after the first message.
You can measure retention of your bot with Botan http://botan.io/?c=cr using Cohort report tab in full web interface.
Here is a bonus track, retention comparison between bots and apps.