You can use two approaches using Selenium Webdriver
First you could use Thread.sleep(60000) and
Second: If you want to make sure that the page is loaded or not below approach will help u out:
Identify an element in the landing page & wait for it to be clickable. You are then sure that the page has been loaded.
WebDriverWait wait = new WebDriverWait(driver,120);
In this case it waits for a max of 120 sec. for the element to be clickable. If the element is clickable before that, your test will be executed.