Talk:Winter 2017 Event/@comment-31348781-20170220004258/@comment-31341342-20170220013424

If you collected all available reinforcement expansions ever since they were added back in the 2015 Summer Event, you could have up to 19.

If you avoided Hard mode in numerous events since then, then you could still have around 10 without having to buy any, so it's certainly within the realms of possibility; especially if you like your subs.