How fast is fast?

[Tsukino_Kaji]

Well if you are starting a brand new account, you do need gil. Silent oil, prism powder can be pretty high in price when first starting the game with absolutely nothing.

That was my take on how to get past maps fastest way possible. Also need some basic gear to play in Gusgen mines. And as WHM, RDM need to buy spells.

Gear and food contributes to how fast you can speed level up until you reach Abyssea.

My point of view was based on as if I start a brand new account how fast could I reach 99, skip a good portion of content and earn a delve weapon/gear.

I've never done skirmish too, just getting Orvail set allowed me to play delve easier.

You don't need any of that in this day and age. Go into zerhun mines, page to 10, stay in zeruhn mines and burn whatever you can get your hands one. At least 30. Go jeuno, start aby, get your chocobo. Burn in la thine until done.
As for war, get your AF, grab a hauby. Get a GA for around 50k. Easy Maat.
The only thing lengthening the time frame is skill ups.