http://crypmixzdkoninjdzublini7zxbmxua6eepnllb3u6lxmv7qkonfoeqd.onion/faq.html
You do not have to stay at the page once the incoming address is delivered. Transfers are automatically processed according the order lot over 24 hours. How long is incoming address valid for? Generated addresses are valid only for about 24 hours.