Mana Flask immunity curse duration flask effect Display?

How i can see my mana flask immunity curse time when i hawe my flask on. theres no display box appear up on the screen.

It sounds like you aren't gaining the Curse Immunity at all. For Life, Mana and Hybrid Flasks, all of their Flask Effects end entirely when you reach full Life, Mana, or Life & Mana respectively. So if you are at full mana and use your Mana Flask of Warding, the duration of your flask immunity is 0 seconds because you spend 0 seconds recovering Mana.

The icon should show up in the upper left corner of your screen just fine.

You also see an icon of a rotating golden statue (golden goddess?) with a circle around her floating above your character while you have Curse Immunity:



EDIT: Totally forgot that I actually do have a Mana Flask of Warding on one of my characters, so I replaced the image with a more insightful one.