In order to build muscle, I do 30 repetitions 4 times a day.
My workout routine consists 4 workouts a day. I perform 30 repetitions in each of these sessions.
Measuring muscle is possible but would require tests to determine your fat to muscle ratio etc. In the context of this sentence the amount of muscle gained for each workout would be so small you could not meaningfully measure it.
Workouts are also recorded in this way when multiple exercises are performed within one session:
30 reps × 4 sets of Dumbell curls.
30 reps × 4 sets of Squats etc...
Reps refers to the amount of times the weight is lifted, pulled or pushed.
Sets refers to the amount of times the groups (sets) of reps are performed. Typically a break of 1 minute is taken between sets.
I hope this has been of some help to you and this answer is more understandable. Please disregard my last answer.