What happens if I do not opt-out of the investment nor complete the investment within the 5 day window?

This will be handled on a case-by-case basis. In some cases, your investment reservation will remain open until the fund closing deadline, upon which incomplete investments will be cancelled. In other cases, such as when an investment opportunity is oversubscribed and there are investors on the waitlist, your investment will be cancelled after the 5 day window and your spot will be given to an investor on the waitlist.