At least 2 times a week for 60 minutes. The more often you can practice the better, however, keep in mind that in this case you should be extremely attentive to your technique. Fix the techniques separately from each other, always keeping in mind ergonomics. Once you master the techniques individually, move on to bundles and smooth transitions.
If you happened to take a driver's license, then you probably remember that the training started from the very basics. First you were told the device of the car, then they taught you to look at the mirrors, stay in the right row and perform maneuvers on the site. And only after mastering and consolidating basic habits were you allowed to train around the city, where you combined skills, taking into account the situation on the road and external factors. Similarly, training in massage techniques involves gradualness with repetition of the material covered.