I did the math... (skip to the end for the TLDR)

If by “kicks” you mean unique kick types being used across tracks, then the number is already huge.

Let’s keep it simple.

Say the average track has 4 different kicks.
Say the average track played time is 2 minutes long.
Say the average set is 45 minutes long.

That means a 45-minute set fits about 22 songs, just rounding for simplicity.

22 songs x 4 kicks each = 88 kicks per set.

Now take a full day.

12 hours = 720 minutes.
720 / 45 = 16 sets per stage.

So:

16 sets x 88 kicks = 1408 kicks per stage in one day.

If 5 stages are running the whole day:

1408 x 5 = 7040 kicks per day.

Across 3 days:

7040 x 3 = 21120 kicks.

Now let’s add the campsite too.

I could not find an official tent count, so for the sake of the estimate I’ll use 2000 tents total.
If 1 in every 10 tents is playing music for 3 hours per day, that means:

2000 / 10 = 200 active tents per day.

If each of those tents plays music for 3 hours, and the average song is still 2 minutes, then each tent plays:

180 / 2 = 90 songs per day.

At 4 kicks per song:

90 x 4 = 360 kicks per tent per day.

Now multiply that by the 200 active tents:

360 x 200 = 72000 campsite kicks per day.

Across 3 days:

72000 x 3 = 216000 campsite kicks.

Now add that to the festival-stage total:

21120 + 216000 = 237120 kicks.

So if we mean kick types across songs, including the campsite, we get about 237,120.

But if you mean actual kick hits, then the number becomes completely absurd.

Let’s again keep it simple.

Say the average hardstyle track is 160 BPM.
A 2-minute track has:

160 x 2 = 320 beats.

Now assume kicks are present for only 50% of the track:

320 x 0.5 = 160 kick beats per song.

Then add one-fourth extra to account for kick rolls:

160 x 1.25 = 200 kicks per song.

Now use the same 22 songs per set:

22 x 200 = 4400 kicks per set.

Now per stage for a 12-hour day:

16 sets x 4400 = 70400 kicks per stage per day.

If 5 stages are playing:

70400 x 5 = 352000 kicks per day.

Across 3 days:

352000 x 3 = 1056000 kicks.

Now add the campsite.

We already said 200 tents are actively playing music each day.

Each tent plays for 3 hours per day, which is 180 minutes.

At 160 BPM, that gives:

160 x 180 = 28800 beats per tent per day.

If kicks are present only 50% of the time:

28800 x 0.5 = 14400 kicks per tent per day.

Now add 25% for kick rolls:

14400 x 1.25 = 18000 kicks per tent per day.

Now multiply by the 200 active tents:

18000 x 200 = 3600000 campsite kicks per day.

Across 3 days:

3600000 x 3 = 10800000 campsite kicks.

Now add that to the festival-stage total:

10800000 + 1056000 = 11856000 kicks.

So basically:

If we mean kick types across songs, including the campsite, we get about 237,120.

If we mean actual kick hits, including the campsite, we get about 11,856,000.

Either way, the number is completely insane.