Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Birth | Marriage | Became Duchess | Ceased to be Duchess | Death | Spouse |
| --- | --- | --- | --- | --- | --- | --- |
| Maria Josepha of Bavaria | 30 March 1739 | 23 January 1765 | 18 August 1765 husband's accession | 7/8 April 1766 Title passed to sister-in-law | 28 May 1767 | Joseph II |
| Archduchess Maria Christina of Austria , Suo jure | 13 May 1742 | 7/8 April 1766 | 7/8 April 1766 | 24 June 1798 | 24 June 1798 | Albert I |
| Princess Henrietta of Nassau-Weilburg | 30 October 1797 | 15/17 September 1815 | 10 February 1822 husband's accession | 29 December 1829 | 29 December 1829 | Charles II |
| Princess Hildegard of Bavaria | 10 June 1825 | 1 May 1844 | 30 April 1847 husband's accession | 2 April 1864 | 2 April 1864 | Albert II |
| Princess Isabella of Croÿ | 27 February 1856 | 8 October 1878 | 18 February 1895 husband's accession | 1918 Monarchy abolished | 5 September 1931 | Frederick |
Question:
When did the duchess who became duchess on 7/8 April 1766 cease to be duchess?
Answer:
24 June 1798