There are 32 tracks, so there are 32 time trials.
I've played Mario kart for a long time and i don't think it allows you to erase time trails
No, you just have to playing with the same mii on your profile.
You can't have endless bullets in any race option in Mario Kart wii, the reason why in youtube you see someone use a bullet bill endless amount of time in time trial, is because he/she hacked their Mario Kart Wii game, using Home Brou Channel, or others.
Diddy kong owns maple treeway, even look in time trails if you dont believe me.
Five characters: Baby Luigi, Birdo, Funky Kong, Mii Outfit B, and Toadette.
To unlock toadette you have to set a time on all time trails, so it depends on if you have unlocked all the cups (star, special, leaf and lighting)or not.
Birdo cannot be unlocked in Mario Kart DS. Sorry :(. She is in Mario Kart: Double Dash!! and Mario Kart Wii though. She is only unlockable in the latter. The easiest way to unlock her in Mario Kart Wii is by completing sixteen races in Time Trials.
You must get eight expert staff time trails which basically means just choose your favourite eight courses and try to beat nintendo at them.
On Mario Kart Wii unlock all the cups and do all the time trials. You'll get Toadette. And Mario Kart DS? I have no idea why this is, but you can't get her! Good luck!
When Mario wins in Mario Kart 7, one of the things he says is, "Oh yeah! I did it!" When Mario loses, he tends to exclaim, "Mario loses, oh no!" Other Mario quotes include "It's okay; I'll get you next time" and "Mario Kart 7!"
A Mario kart ghost is the same character you had used in time trials, so in order to beat your ghosts time simply race it to a duel
No He is W-R-O-N-G, But it may be difficult not having the staff ghost data to know how far ahead you are of the staff's time