My manager needs accurate estimate

just say some absurd time estimate and double it. From there you can trade it downwards.

It'll take three years. No way! you get a year! That will never happen! 2.5 years! out of the question 1.5 years and not a day more! ... 3 months later: Hey pm, I'm finished what now?

There's a fine art to this science.

Pick a number... don't say it yet.

Multiply by Pi and round off to closest full day.

Now say the number.

Never again will you have estimate issues.

There's no such thing as accurate estimate. Best estimate perhaps but for the estimate to be accurate you may have to open a third eye to look into the future.

Nice example of an oxymoron which everybody should understand. Except for managers, I guess.

Welcome to software dev. where your job is to spend all day wondering why your manager gets paid!

just fart and start timer when your fart is finished stop timer.

time:Float = timerNumber

while(time < 1)
time*=10

if(time > 2)
time = 2

now multiply time by your birthday(just day number)

and end

its work believe me.