15 for me...for now.
Squat, SLDL, Row, Bench, overhead pres, pullup, cable crunch, conventional deadlift (different time - late in the day), leg extension, good morning, calf raise, shrug, curl, skull crusher, decline dumbell bench.
Since I'm only doing the standard HST with the reccomended increments and only doing 1x15, 2x10, 3x5... then I can handle more exercises.
Later, when I increase the volume per exercise 2x15, 3x10, 5x5... again I'll reduce the number of lifts to 6
Squat, dead, bench, row, overhead press, and Pullup...maybe cable crunch too.