Thirty spins aren't $30
A spin is one bet at a stake the casino sets, not a dollar of credit. DuckyLuck and SlotsandCasino set theirs at $0.50, so 30 spins give you $15 of play. America777 and Europa777 don't print the stake for KKA, so check it in your account before you start. Any spin can win nothing at all.
KKA spins go on Pragmatic Play or Platipus slots, but not every game from those studios counts. Play the slot your spins are credited to. DuckyLuck's spins are on Wrath of Medusa and SlotsandCasino's are on Mythic Wolf.
Turn the wagering into money
The KKA claim pages show 70x on the credited bonus, with a $5 max bet. If your spins credit a $10 bonus, 70x means $700 of qualifying bets. DuckyLuck and SlotsandCasino use 40x winnings plus deposit. A $10 win on its own needs $400 of bets. If a $25 deposit counts too, the target becomes $35 × 40 = $1,400.
Older partner terms put KKA at 45x, which would be $450 on the same $10. We show 70x because that's what the casinos' own claim pages say today, and it's the safer number to plan around.
The cap and the deposit are two different things
The cap is the most you can take out. It's $50 at the KKA casinos and $100 at DuckyLuck and SlotsandCasino. Anything above it is removed when you withdraw.
The deposit is what you pay in before you're allowed to cash out. KKA needs $25, SlotsandCasino needs $25, and DuckyLuck may ask for one to verify you. At the KKA casinos, skip the welcome bonus on that $25 and you can withdraw it along with your winnings.
KKA or ZKA, not both
KKA gives 30 spins and ZKA gives 20 at the same two casinos. America777 and Europa777 allow one free bonus before your first deposit, so you pick one. Take KKA, because it's 10 more spins on the same terms.
Work to 7 days for KKA wagering. That's the shortest deadline in these casinos' terms, while older partner terms said 30. Check the clock in your account as soon as the code goes in.