The level of accuracy for order of magnitude estimation is 1. -25% to +75% 2. -25% to +50% 3. -25% to +25% 4. -25% to +10%?

It may goes between -25% to +75%....

The level of accuracy for order of magnitude stage estimation would be 25 to 50%

The order of magnitude is preferred during initiation phase, and it has an accuracy range of -25% to 75%