If you are luck, have the material in hand, find groups willing to teach you the Legion raids, and you get at least one character on tier 3.
I’d say two months, minimum.
Why? Game gatekeep you from obtaining the relic set.
Every week you get enough for one part (if you finish valtan hard 1445), you need 3 parts.
Irrc you get a small boost in honning percentage when you get a relic part.
After 1460 you will be able to do Vykas hard, that’s the other 3 parts.
Some sets have 4 parts as Vykas material, some, and the weapon is quite expensive too.
Now, considering you manage to reach valtan hard with the express event, you will still be gatekeep by the community, because you are on the cap for the content, meaning, you will lose hours just trying to get into a lobby.
And if you push over for 1460, you will be gatekeept harder in Vykas.
Let’s assume you manage to overcome both, and now you have the relic set, you need to upgrade it by doing kakul, people often ask for the boxes containing the material to upgrade, if you find a static, you may get one box every time it’s your turn, plus some from the raid, adds another two months of raiding.
You will finall, after 4 months (or two if you skip Clown) , reach abrelsbud/brelshaza, there you will get another relic set, which uses a other new material, becoming easier to upgrade.
Maybe next month or the one after, we will get brel hard, which will give us another set rarity, and that’s where everyone is at.