The missions range from fairly short up to much more involved with multiple quest phases. (lifeisxbox.eu)
Players can work on multiple quests at the same time, and can fast travel between discovered portal locations by spending currency. (adweek.com)
Over the course of the next 4 days, we will be publishing multiple Quests inside Feedback Hub that will highlight different areas of the product each day. (blogs.windows.com)