Since Excel 2007 (Windows) and Excel 2008 (Mac), the number of rows in a .xlsx, .xlsm or .xlsb worksheet is fixed at 1,048,576. That is 2^20. Excel only stores the data and formatting actually used, so there is no penalty for having such a large number of rows in every worksheet. The file format isn't being changed for Excel 2016, so the same maximum number of rows still applies.
Using your money in Ireland: Northern Ireland and the Republic of Ireland have different currencies. In the Republic of Ireland the currency used is the Euro and in Northern Ireland the currency used is the Pound Sterling.
The currency for the Republic of Ireland is the Euro and for Northern Ireland is the Pound Sterling. Proper currency is required when traveling between the Republic and Northern Ireland. You can exchange your current money for Euro or Pounds at the airports, Ireland banks and local ATM machines.