So I've been doing this for about 4 hours now. What you'll need for this is: 5 rift keystones A fast thumb That's all. What you do is pay for a rift and get to the end, kill the guardian and leave. Talk to Orek and once the countdown begins stand near the obelisk and once the timer hits 1 tap A or X (if you're on PlayStation) right when it start to close. You'll enter another rift for no charge. I don't know if anyone else has found this but I did it when I was trying to finish as many rifts as I could before work. Funny how those things work eh? Enjoy!
You can continually do rifts with a friend by not turning it in when you beat the boss by following these steps: 1) clear rift 2) host leaves (causes game to reset state) 3) clear it with new host (old host can join and clear too) 4) repeat steps 2&3 FOREVER lol
Or you could just mod keystones and not ever worry about it again. Glitching, hell why not just mod the things!?
Because I don't own a 360 or a 360 copy of RoS so it makes it hard for me to do that unless another person does it for me.
Another easy way on the PS4 is to mail rift keys to another acount, then hold the ps4 button immediatley and LOG OUT of your PSN account! Log in to the PSN account you mailed the keys to and accept the mail. Then send the keys back to your main PSN account. at this point its up to you, you can either log out (which will remove the keys form your 2nd accounts inventory) or you can qut the game leaving htem in your inventory. When you log back into your main account you will se that you have doubl thekeys you had before. To keep the keys you need to quit and let thee game save, do not log out of your PSN profile or they will disappear.