Apple Wallet Push Token length

For the pushToken sent by APNS to register a wallet pass for update notifications, is there a max length or size that APNS will send? I save the token in my database and have it defined as varchar(256), but I have had some instances where the pushToken is larger than that. I'd like to know if there's an absolute max size that APNS will send. Then I'll know if I should reject requests with tokens larger than what's expected, and/or if I need to make the token size larger in the database.

Apple Wallet Push Token length
 
 
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