How long are invites valid for?
Invites that you receive through invite holders are typically valid for 24 hours. If they expire, they get returned to the sender so they may be re-allocated - you can ask the sender to send you the invite again.
"Thanks for getting in touch! The invites' validity period is predetermined, so I'm afraid it's not possible to change it. This way, we ensure the fastest way for our fans to get our stock. When your invite expires, you pass it on to someone else waiting to buy the OnePlus One now. Don't worry if you can't buy it now - we'll be giving out lots more invites in the following weeks "
Good luck next time!
OnePlus Community Annual Satisfaction Survey
by Zach X., 2021-01-19