"long time project" is correct and usable in written English
You can use it in any context where you are talking about a project or task that is going to take a long time to complete. For example, "Our history research project is going to be a long time project—we expect it to take several months to finish."
A long-time project of O'Connell, who has hosted live comedy shows on BBC Radio 5 Live, it is initially planned as a one-off show but could be repeated in the future.
I'm a fan of long-time projects, and they offer results, look at Spain, it started with the youth teams … and the same with Germany, [Jürgen] Klinsmann and then Jogi Löw, who was his assistant.
As it often takes a long time for project impacts to materialise, only a repeated (and simultaneously elaborated) evaluation process can provide more detailed analysis of project or programme impacts.
"It's surprising that our gut microbes, which we could get from many sources in the environment, have actually been coevolving inside us for such a long time," says project leader Howard Ochman, an evolutionary biologist at UT Austin.
For a long time the project was held up.
"They will lose the trained workers who've been working for a long time on this project.
Mr. Shah said the couple wanted the apartment to look as if it had been lived in for a long time, although the project, he added, "was a full gut job".
Holger Bech Nielsen, a Danish physicist at the Niels Bohr Institute in Copenhagen, and one of the early pioneers of string theory, has for a long time pursued a project he calls Random Dynamics, which tries to show how the laws of physics could evolve naturally from a more general notion he calls "world machinery".
It had been a long time coming – a project famously caught up in development hell for 15 years, going across the desks of executives from three different Hollywood studios and eventually produced by Warner Bros. From the moment the first Mad Max: Fury Road trailer premiered at the start of the year, the film generated a groundswell of online hype.
It's not that they can't be bothered (I spent a long time with the project architect, Jeppe Ecklon, who has spent years of grunt and sweat on getting the museum more or less as BIG wanted), but they are not greatly interested in perfection.
We've had our eye on the Pandora for a long time, but the project has been stricken with delay after delay.
