Some questions about link building

hi all,

I have several questions;

1) what is the optimum, easy, and hard balance of exact search / competition(allintitle). (reckon without other criterion)

2) When (how long) will we start to get positive serp results for our link building activities. For example I completed a link pyramid before a week but I don't get any positive results on serp.

3) I have a niche which exact search is 27.000 and competition(allintitle) is 90.000. Is this hard to get positive results on serp? (or medium or easy)

thank you for your ansvers...

for 2nd question,

It depends upon the crawling of the website where you built the links, usually it takes 5-15 days but in some cases this time interval also get more lengthy.

for the 3rd one,
Depends upon against whom you are competing but i would not mark it as easy.