How long does picky eating usually lasts? I've read the same things in the web over and over. Anybody who has a different approach or best tip to deal with it?

I suggest, try changing the recipe for him. Cook the food differently than the way you usually cook. You know, how it is with adults as well. We also get bored of the same food that we have everyday and want a change. Same with the babies. And as far as being a picky eater is concerned, I think that kid remains one till the time their tantrums are being entertained. If you will not entertain his rejection, he will eat whatever you will feed him. Like, if he doesn't eat a vegetable or any food that you feed him, let him go without food and then when he will be hungry he will himself pick the food and eat. You know how it happens in hostels.