You are eligible to redeem your Collector Credits once you have 500 or more, but you do not have to redeem right away.
There is no limit to how many you can earn overall.
You can continue to accumulate more Credits, and therefore more Rewards, and redeem when you are ready*.
Find out more about our Collector Club here.
*Note: only one discount can be applied at a time. For example, you can not use a Collector Club Reward and take advantage of a special offer discount at the same time.