Minor trick/exploit.
During timewalking, when doing the first dunegeon you get a 500 TWB quest item. If you get the item but don't take the quest (don't use the item), and do a second dungeon, you will get a second item, however you will not be able to pick it up due to it being unique. However, the friendly postmaster will send it to your mail afterwards.
You can then use the item in your inventory and hand off the quest, and after handing in grab the other item out of your mail. You will not be able to hand in the second quest until the next (same) timewalking event, however this enables you to skip 50% of the TW events and still get the max easy badges out of them. Not really a great exploit, but if you have 10 alts it cuts down on your TW every second time, while still getting the benefits.
Mainly relevant if you don't also need the caches you get from the 5 dungeon completion quest.
Enjoy, and ty all for the useful stuff posted here.