Isn't the 30min limit only for cameras sold in the EU? Devices who can record more than 30min are categorized as Camcorders and you have to pay 4.9 % import tax.
But taking 30 mins of HD content gives you already a huge file so filming in parts is probably better.
Don't know about overheating in cameras.
@DownLikeBCPowder: i don't think that there is anything (new) for 200 $.
Samsungs NX ,Nikon 1 or the NEX-3N start around 250 - 300 .
For $188/ $189, you can grab the Canon Powershot SX280 HS. HD video and solid optical zoom.