- Your auction duration can be up 30 days. Flippa can extend an auction up to that duration if the Reserve Price has not yet been met.
- You can end the auction early if desired, but if the highest bid meets or exceeds your Reserve Price, it will make that bidder your listing's Buyer.
- An auction may be automatically extended by Flippa's system for up to one hour if a new winning bid is placed within the final hour.
You can find some more information here about listing duration.