Quests are one of the newer features added to Clash Royale. Completing quests (given to you daily) contribute points to unlocking a chest (once you click "Collect Reward") assigned to you in the quest log page. More rare chests require more points to unlock and vice versa.
My question comes in two parts:
1) Is there a limit to how many completed quests I can hold before collecting my rewards?
2) Does the game know I've completed the mission and count it towards my total before I collect the reward?
Example: I have 490/500 reward points for unlocking a chest. I complete a quest worth 20 points. In game, until I collect the reward my chest shows 490/500. Does the game really know that I am 510/500 (or 10 points/X new required points)?
If you are wondering "why ask?" It is becoming increasingly imperative for free-to-play players to maximize their chance at getting new cards. If you earn a super magical chest in arena 5, it does you no good open the chest once grinding to arena 11 because the chest still has an "arena 5 value" assigned to it. If a card is going to be released Tuesday, and I complete and collect all points required to open it Monday... Waiting until Tuesday to open the chest is pointless because it will only have Monday's-specific card pool to pull from.