Validate Instantly For Difficult Questions

Donโ€™t use inline validation while the user is typingโ€Šโ€”โ€Šunless it helps themโ€Šโ€”โ€Šlike in the case of creating a password, username, or message with a character count.
Here are some benefits of implementing inline validation with real-time feedback just right after the answered question according to the researchย made by Luke Wroblewski(this research has been conducted 8 years ago!):
โ€ข a 22% increase in success rates,
โ€ข a 22% decrease in errors made,
โ€ข a 31% increase in satisfaction rating,
โ€ข a 42% decrease in completion times, and
โ€ข a 47% decrease in the number of eye fixations.