Luffy could use Gear 4 for much longer, as seen during his fight against Kaido. Once Luffy learned how to infuse Conqueror's Haki into his Gear 4 attacks, his battle against Kaido was more even.

Gear 4 Luffy is one of his most powerful fighting forms in One Piece, but it comes at a cost. Once Luffy deflates, it requires at least 10 minutes of recharge to use Armament Haki again.

One Piece’s Luffy Transforms Into Gear 5 in His Fight Against Kizaru. Luffy first takes on his Gear 4 form, which isn’t nearly powerful enough to defeat Kizaru. Even so, ...

Episode 1,071 of One Piece saw Luffy awaken the Gomu Gomu no Mi and achieve Gear 5. Throughout One Piece, Luffy has achieved various stages of ultimate power, known as Gears, which aid him in ...

Essentially, when in Gear 5, Luffy can fight as his imagination dictates. Follow this thread to learn all the different techniques that Luffy used in the three fights in which he employed Gear 5. Ad.