It was mir like 15-20 Minutes to get the collected Button and categorie "adapdet" does not want to give in.
Summer Card Rush 2 Bugged?
In my case... it's the Hearts Day1: Flaming Hot Desire that I can't collect. I read again and again but failed.
I spent 2 hours reading one of the comics yesterday, then ended up having to pay to collect the card today. Of the new cards today, I've only managed to get Webnovel to recognize my 10 minutes of reading time and let me collect 1 of the 3 cards (even though I'd read all the comics for 10+ minutes). Had this issue with a previous card event too. I'll give it one more day before I give up.
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I wonder what was wrong... 
This is really annoying...
Only today I saw it coming the "Collected" notification of receipt of the cards ...
previously i read each of the comics for 20-30 minutes, not receiving any notification for 3 days in a row i thought it was normal...
there was also that strange phrase in the rules "the card will be send to your mail after the event ends"
Will Webnovel fix the problems and will we get the cards (day 1-2-3 cards for me) or will it ignore things?
At most WN can allow the last day to be able to read and receive any card left behind ... but I doubt it because otherwise they lose the 5 Coins for those who have lost them (or the victims of bugs)
Day 4 cards not collected even though I read more than 10 minutes
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The same thing happened. I tried doing this: A, either stop reading and come back another hour or two later. But doing this didn't work on day five no matter how long I read. So I logged out and logged in back again, clicked on the event. There should be a little house icon on top left. Click that and it will take you to the front page where three words are pulsing: Brain X adapted X heart. Click on whichever one you haven't collected and it will give you the full card and a read button at the bottom. Click that and read for 10 ( I did 15), and when I did so, I managed to collect the card! Then click the home icon on the top left again, click on whichever choice left, whether its Heart or adapted and do the same thing. Let me know if it works!
7 days later
Palaso Palaso Palaso Another bug experience!
Day 12's 3cards failed to collect. I started reading at 2200H +8GMT each card of at least 15mins. When it didn't turn to collect I took another round of reading until the time's up, sadly it was still a failure. 
Uncollected bugged cards:
Day 2 = 3 cards
Day 12 = 3 cards
Palaso Palaso Palaso Another bug experience!
Day 12's 3cards failed to collect. I started reading at 2200H +8GMT each card of at least 15mins. When it didn't turn to collect I took another round of reading until the time's up, sadly it was still a failure.
Uncollected bugged cards:
Day 2 = 3 cards
Day 12 = 3 cards
Palaso Palaso Palaso Another bug experience!
Day 12's 3cards failed to collect. I started reading at 2200H +8GMT each card of at least 15mins. When it didn't turn to collect I took another round of reading until the time's up, sadly it was still a failure.
Uncollected bugged cards:
Day 2 = 3 cards
Day 12 = 3 cards
Would it still be considered bugged when the time meter lagged due to stormy weather? I've been reading for 2hrs how come not 1card is collected. 
I gave up on this event. I read all the chapters in the comic and still didnt get any cards.
I want to add to this. I didnt have any bugs until the second to last day where for two of the choices. I read from the start to where the pay wall is multiple times. And they would not mark as collected. I tried reseting my phone, stopping the app, tried to spend the ten minutes reading the chapter backwards still nothing. The next morning tried again no results, thought when the day switched over to the last days comics it would finally give me but still nope. Well I got the badge.
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Palaso Overall experience is that I got new comics to read. 
But as for collecting cards, it's a lot more heartache since you spent at least 30mins a day yet you were compromised. I've lost 3FPs due to this.
Card collection:
Collected = 30cards
Missed* = 12cards (Day 2, 12, 13, 14)
Badge = still doesn't have
*due to 'meter' failed to count my reading
Okay this summer card rush event is going so smoothly for me ..I collected all comics card without any problem until day 13.
And on a day 14.. ? "Baaam" no single card is collected on the last day when I was an inch close. I've been reading it far more than 10 minutes but all futile.
I sent an email to webnovel ...
service@webnovel.com
hoping that (I doubt it) they solve something ...
I also added the link to this post, hoping that if they pass through here we can solve this problem.