Combined Potions for Level 20 or remove 5 second potion use time delay for buff potions

Having to do 8 buff potions to get buffed by potions, and 5 seconds between each stat potion, and having a bar full of potions, and it takes like 40 seconds or whatever to do all your buffs, that is a long time. I have a full bar filled with potions. I just think why have 5 second delay. You don't have a delay between different potion types like regenerative, haste, stat. Why not just have it like this for all buff type potions?