There is no maximum amount you can claim but each country of refund has set minimum claim amounts that can be refunded.

In most cases countries distinguish whether your application covers any VAT you’re reclaiming for the full year or for a smaller period other than the full prescribed year. 

In UK the thresholds are as follows:

When your application is for a period covering less than twelve months the total amount of VAT claimed must not be less than £130. The application can cover less than three months if this is all that remains of the prescribed year. In that case, or when the application is for the full twelve months of the prescribed year, the amount of VAT claimed must not be less than £16. You can also include items missed on earlier applications as long as they related to VAT charged in the year of the application.

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