Are you following the storyline? You'll know when the game is finished, it won't let you wander about aimlessly.
The number of days doesn't really tell me how far along you are. I think the record for completing the game is 7 days, but you could easily stretch it over 50 or more, especially on your first playthrough. It'll impact the score, but personally I don't really care about that, it's just a number at the end of the game; the important thing is that you have fun.
So which part of the (game) world are you at now? Have you looked at the world map? You'll have to venture to all of those continents before completing the game, nothing on there is just for decoration. Actually, you'll have to do more than just venture there.
As for recommendations, I'm afraid I have none. I never really got into RPG games, but I love strategy/RPG or adventure/RPG hybrids, and I'd put King's Bounty into the former category.