One hour? Because their site was broken and wouldn't allow me to see open positions I was unable to close a significant short for over 6 months, when the price was rising from 2000EUR
to 4500EUR and eventually got liquidated on a relatively small rise after one margin call in the middle o the night.

Total loss: five figures.  Compensation from Kraken: low two figures in credits, which I can't event make use of, because it's impossible to trade. Stay away, there's better places to lose your money.