Small tweaks for potions durations, mostly for higher difficulties so they last little longer for bigger combats
Optional files for decocotions.

v1.1 Changes (for patch 1.10) :

Black Blood (90/150/240) was (30/45/60)
Blizzard (20/30/45) was (15/20/30)
Full Moon (90/150/240) was (60/90/180)
Golden Oriole (90/150/240) was (60/120/180)
Killer Whale (720) was (240)
Petri Philtre (90/150/240) was (30/60/90)
Thunderbolt (90/150/240) was (30/60/90)

Optional file :

Base decoction duration (3600=1h) was (1800=30m)

OLD - v1.0 Changes (for patch 1.8) :

Black Blood (60/120/180) was (30/45/60)
Blizzard (20/30/45) was (15/20/30)
Full Moon (90/150/240) was (60/90/180)
Golden Oriole (90/150/240) was (60/120/180)
Killer Whale (720) was (240)
Petri Philtre (60/120/180) was (30/60/90)
Thunderbolt (60/120/180) was (30/60/90)

Resource generation potions :
Maribor Forest - no change Tawny Owl - no changeHealing potions :
Swallow - no change White Raffard Decoction - no change **Cat - no change (240/480/720)**Pheromones - no change

Potion quantity not changed

Mod should work with saved games and in NG+

Installation :
extract to game folder Witcher3/mods/

Modified files :

1. /gameplay/items/def_item_alchemy_potion.xml
2. /gameplay/items_plus/def_item_alchemy_potion.xml

(optional for decoctions)
3. /gameplay/items/def_item_alchemy_mutagens.xml
4. /gameplay/items_plus/def_item_alchemy_mutagens.xml