API Question, RequestCampaign - Token Character Limits

When passing token data using the RequestCampaign API call, are there any field length limits on the values for the token types 'Rich Text' or 'Text'? Or any other restrictions on the API call that may restrict the amount of data passed via the tokens?

Tokens are in the request body at the path: TriggerCampaignRequest>TriggerCampaignData>tokens

https://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Campaigns/triggerCampaignUsingPOST