Exit polls are instant. The national implications of elections are usually declared around 3-5am (counting starts around 10pm). The last constituencies usual de

Exit polls are instant. The national implications of elections are usually declared around 3-5am (counting starts around 10pm). The last constituencies usual declare by midday the next day. In the last UK general one constituency took two days - there were about 12 votes between the top two parties so they did a few recounts.