What is the redmage 2-hour?

[Digital]

If the monster uses MP, Chainspell + Aspir is always fun if you need some MP.

[Alucath]

The interesting thing about Chainspell is that it's multi-purpose, and in that way it mirrors the job of Red Mage. If you need too, you can use chainspell to cure everyone in your party and save lives. Cut down on chaining time and chain-nuke a mob, raise everyone lightning fast so you don't have to wait so long for weakness to go away, really the possibilities are endless, especially with refresh and convert.

[Patchinko]

My main "use" for it is to escape bad situations.

For example I was helping my WHM friend get his coffer in Fei'yin for Telepo-Vahzl and invis came off just inside a golem's range of sight. Got double-slapped for over 100 immediately and hit my Chainspell>>Warp macro. Saved my life.

Prior to having warp, I had situations where I would die because it would get interrupted or not cast fast enough. Or, if I had used two hour recently, it would be a problem.

For example, silly WHM (same one actually) aggroed a Wespe in CN inadvertently when we were hunting Exorays. In the confusion of trying to help him one came up behind me and slapped me for over 100 (and I had only 450HP or so at that time). I tried casting Warp and got interrupted. Then I tried again and it went off.... but I arrived at the homepoint as a corpse (much "THERE'S A DEAD PATCH AT HOMEPOINT!" shouting ~.~). Unfortunately I had used up two hour and the timer had not reset yet...

And of course there are the times in Eldieme, Garlaige and Castle Zvahl Baileys that I've been forced to use it as well.

Sufficed to say, it can be quite useful for this. Chainspell>>Escape can be used similarly to save your entire PT after lvl58.