Limitations on number of questions per survey

First of all kobotoolbox is a great tool for creating questionnaire for surveys , conducting the survey and analyze the data. We have been enjoying its ease of use. However recently we have implemented this for big project and we have few queries.
Is there limitations on number of questions per survey or per submission? We have a survey with 450 questions in it. Will it create any issues while submitting large number of surveys?
Also ,has the limitations on number of submissions, 1500 per month or 5GB per user per month been increased?

Thank you

Best Regards