Original sentence: A return was announced in August 2008 that TV3 will broadcast the 21.5 hour Telethon "The Big Night In" starting at 8.30pm on Saturday 8 August 2009 featuring a host of celebrities including New Zealand and international stars.At is time, New Zealand telethons had become world famous with global stars vying to be invited to participate
Edited sentence: A return was announced in August 2008 that TV3 will broadcast the 23 hour Telethon "The Big Night In" starting at 7.00pm on Saturday 8 August 2009 featuring a host of celebrities including New Zealand and international stars.At this time, New Zealand telethons had become world famous with global stars vying to be invited to participate