「このビジネスをつくるまで、それなりの時間を要した」って英語でなんて言うの？

"Built it from scratch" and "Built it from the ground up" describe that you started the business yourself, and that you have worked hard and for a long time to get it to be the success it is now. The words "scratch" and "ground up" denote that you started the business with very little, and that you are the main person, or even the only person, responsible for making it the success they currently see. "I worked hard to get where I am" is pretty self explanatory, it can be used for private business entrepreneurs and company employees. For example, an employee that works in a company and has worked hard to receive a promotion, may say this as well as a an entrepreneur that built a business by themselves.

Well you may be casual, or super cool. 'After a few years of graft, the business seems to be thriving.' In this sentence you explain how you 'grafted' which means 'worked hard.' You notice casually that the business is doing OK although as owner, you are obviously more than an idle spectator!

when speaking of building something from scratch or started from scratch. "i built it from scratch". or "blood, sweat and tears!". to have toiled and spent effort nurturing something.

When we see someone who is successful, sometimes we forget that it took a lot of time and hard work to get there. You can tell people who think you were just lucky that "It took a lot of hard work to get my business to where it is now".

When you have built something up from scratch (the beginning) then when it is doing better or well then you call this 'where it is now' meaning as goos as it is now If the person knows what you are talking about then you can say 'it took alot of hard work to get it' but if they don't then you can say 'my business took alot of hard work' a common saying when you have worked hard is alot of 'blood sweat and tears' meaning you put everything into it and it was alot of hard work

"I have built this from the ground up" This expression expresses that you have built/made a business from nothing into something very impressive. 'Ground up' is the expression used for this. "I built this business from scratch" From scratch is an expression used when referring to how well something has done, from nothing to something productive.