It almost certainly is designed to run indefinitely, this exact same coffee maker has been in production since the nineties or so. the only addition is the timer circuit, which is very clearly a much later addition, as the supporting structure is markedly different tk the rest of the device.

Anyway, a 240v switch is in order, I think. Fortunately we still have Farnell here in the UK, I shouldn’t like to pay international shipping fees for a single switch from china.