Terraforming Mars

As the title & description written, what do you guys think? Even it is not needed yet for us. I know this kind of silly, I brought up this matter because of a slice-of-life anime titled Aria. In that anime Mars terraformed and changed into planet named Aqua. Even just by watching, that anime give me the relaxing, peaceful, & wonderful feel, so I think it would be nice if Mars become like that. In the end, I starts wondering how long it could takes for Mars to be a planet that can be used stay by living beings(I won't say "Mars to be a planet that can be used for colonization", because colonization giving me weird, & gloom aura.)

I really appreciate any replies. :)

O_O random topic but ok i would say a LOOOOOOOOOOONG time not im mine or your lifetime probaly longer than 100 years,no DEFINATELY longer than 100 years unless they invent some way of better space travel and terraforming mars ... that itself would take **** agggggggggggges but ofc it would be awsome + i hate the word colonisation cause it reminds me of bee/wasps/insects in which i haaate -.-'