Currently, there is an automation option for a 24-hour email reminder to be sent to all participants signed up for a Wix booking. However, 24 hours in today’s world can mean lost emails, searching for a link and arriving late or simply forgetting to show up. This is less than ideal for a client and staff member.
Creating this automation to be flexible with 24 hours, 2 hours, 1 hour or other customization timeline would be greatly appreciated!
Hi, I’m Ireen from the Wix Bookings team 
- As you’ve mentioned, currently it is not possible to change the timing of reminder emails that you send to clients before a service. We’re researching the best way to provide this sort of flexibility – we know it is extremely important - and we are collecting votes here: Wix Bookings Request: Choosing the Timing of Reminder Emails | Help Center | Wix.com
Hi, you may try using Velo by wix(coding), so you can have a better management on most of the things with bookings app by wix.
@ireenh Thank you for pointing me toward this - looked and was unable to find an existing request. Just voted for it!
@wingcc Thanks for the suggestion - I have started using some code to customize, although I am still getting familiar. Did not see any templates or sample code regarding time, which would be my best option for this given limited time resources.
Since up to this moment, there isn’t any place to buy template/kit with wide range of needs. So… hope you can get it done 
Hello,
Interestede too !
Same problem … My customers ask for the same thing: to be able to modify the reminder by email (and by sms)
Again, please see twilio examples
And work with wix bookings api to get it done