You need to use this visa before it expires in July! Once you've entered you get stamped in for a 60 day visit. It's multi entry so you can leave and re-enter for 60 days.
people experiences will differ because they apply at different embassies. Those embassies decide what they require. So if seeking an answer you'd have to post the question to include which embassy you are applying through.
It's 72 hours from day of arrival. You know what day you land, just count back from there. You can fill it in even on day you arrive, before you pass immigration.