To earn all the rewards during the previous Merge 5 Event you needed 6000 total points!
15+65+150+270+250+650+800+925+1250+1625=6000
For the most part, basic 5 merges gives 5 points so in that case it would take 1200x 5 merges to get enough points to collect all the rewards.
The higher the level of the item you are merging, the more points you get… *Refer to Point Values below*
So if you merge a higher level item like Level 7 or 8 Stone Bricks it will give you 8 points.
Therefore if you were to only make these higher level merges that give 8 points, it would only take 750x 5 merges to complete the amount of points needed to get all the rewards.
I suggest making higher level merges as much as possible!!!
To beat the event it can take from about 750 to 1200 total 5 Merges! Maybe even less depending on the items that will be in you Secret Capsules. In the previous Merge 5 Event some of the Bronze Secret Capsules had green 5 leaf clovers that gave additional points! Look at the image below!