To get serious money (not F&F or small angel) you should plan on at least 6 months and possibly 9 - 12. That assumes you have a reasonable business, and a good story and presentation material (1-2 pager, deck, f-model), and good management.
You'll need to create a strategy for targeting the investors who are interested in your sector, stage, and geography. You need to reach them and convince them to listen to you. Then you many need to modify some parts of your company (e.g. management), and go back for multiple meetings. Then you get a term sheet and begin negotiation. Assuming all goes well the investor does their due diligence and you get an agreement and possibly more negotiation. Then you get the money.
Of course there are many variables and everyone has heard the story of someone writing a check quickly, but those are the 1 in 10,000s. Don't assume you will be one of those.
Keep running your business to create value as much as you can during that time and if you achieve milestones that investors agree are the right ones, you should be fine.