The high-speed TGV service from Lille Europe to Nice takes around 7-8 hours, passing through the whole length of the French countryside. There are only two services a day in either direction. A more frequent alternative journey, Paris - Nice (TGV) is also available, but can be a little more inconvenient than the Lille - Nice option if you are coming from a connecting train due to the cross-city Metro change at Paris.
Travelling on TGV
The French rail network offers passengers the chance to travel anywhere within the country in a matter of hours. That wouldn't be possible without the iconic TGV; one of the fastest high-speed trains in Europe. There are four classes of travel available to passengers: Standard Class, First Class, TGV Pro (Business) Standard, and TGV Pro (Business) First.
Everyone has access to a buffet car which serves hot and cold food, as well as drinks. There tend to be meal deals available which make eating on the train a reasonably priced offer, although still more expensive than bringing your own food. There are also vending machines for snacky purchases.
TGV carriages are generally very spacious and comfortable, with plenty of legroom, drop-down tables and power points. In First Class, passengers can choose to have Solo seats, which are single seats, which each facing the back of the one in front. Duo seats are available to all classes (two seats next to each other, facing the backs of the ones in front). Pairs of seats facing each other across a table are available in all classes, whilst first class also offers single seats facing each other.
First Class passengers have access to extra legroom and power-assisted seats. TGV Pro Standard customers get the extra legroom as well as a welcome service on some services. TGV Pro First cusomters get everything, as well as access to business lounges, dedicated carriages and travel packs.
Each passenger is allowed to bring two bags or suitcases on board (unlimited weight), as well as one piece of hand luggage (beat that low cost airlines!). Bulkier items can also be stored at the end of carriages. Remember to label any luggage that you leave unattended though, as this is taken quite seriously.

