Be really, really, like really really careful with that one. Obsession is not the thing you should cater with unlimited access to you. Do what feels comfortable to you but take into account your time, how many hours of the day there are, are you ok with being on call, etc. What are your expectations from your clients once they have access to your 7-day WhatsApp option? Whatever it is, make sure you outline it to them. You really don't want someone else to dictate your limitations