For the 3-4 years I trained for olympic lifting I trained some variation of the snatch, clean & jerk and squat at EVERY workout (5-6 training days per week for 5 to 10 weekly sessions).
All international-level olympic lifters train the compatitive lifts (or variations) and the squat (or variations) AT LEAST 4 days per week. Most of them train 6 days a week with 9 weekly workouts being the norm:
Monday: 2 daily workouts
Tuesday: 1 daily workout
Wednesday: 2 daily workouts
Thursday: 1 daily workout
Friday: 2 daily workouts
Saturday: 1 daily workout
NOW, this is not a recommendation. Olympic lifter build-up to this training frequency over a 4-6 year period. However basically all competitive olympic lifters start with at least 3 weekly sessions working the whole body on all 3.
Russian powerlifters use a similar methodology (their methods being based on the old soviet olympic lifting system) training all the competition lifts at least 3 times per week.
This doesn't mean that this type of schedule is ideal, but it shows that it can be done.
However it requires a proper volume/intensity approach. The total reps have to be very low and there should be some form of intensity variation during the week. Olympic lifters will wave the intensity during the week WITHOUT CHANGING THE NUMBER OF REPS PER SET. For example they might per form the snatch 3 times per week...
Workout 1 might use an average of 90% for all the work sets and rely on 2-3 reps per set.
Workout 2 might use an average of 70% for all the work sets but still use 2-3 reps per set.
Workout 3 might use an average of 80% once again for sets of 2-3 reps.