As long as you are switching flavors throughout the day, you don't have to worry about getting vapers tongue.
I have 8 different mods going, with 8 different flavors scattered around the house, and I only use one for about 5 minutes before I grab a different one.
What happens is the "flavor" really comes from your nose (olfactory glands).
You mouth only tastes sweet, sour etc.
Like having a cold and you can't taste the flavors.
Anyway .. using the same flavor all day gets boring to your mind, and it then shuts the flavor out, like white noise.
Have you every been in a house with an unpleasant odor? ...
Have you noticed that if you stayed there long enough, you didn't notice it anymore ??
Same thing ... brain gets bored with the same-o.. same-o and turns it off.
Some people lose it for days, some for weeks.
There are things you can do to shock the glands back into service, like taking the lid off of the coffee can, and breathing the fresh fumes of ground coffee, scrubbing you teeth and tongue, eating hot peppers, sipping pickle juice ... vapers have tried it all.
Just keep a rotation going and you'll be fine.
In 5 years, I've never had vapers tongue .. but I've never vaped just one flavor all the time either.