time-consuming

[ tahym-kuh n-soo-ming ]

/ ˈtaɪm kənˌsu mɪŋ /

(of an action) requiring or wasting much time.

Origin of time-consuming

First recorded in 1930–35

Yes, I am familiar with people asking me to do time-consuming projects for free—I get at least one such request every day.

Rich People Want You to Work for Free |Ted Gioia |October 20, 2014 |DAILY BEAST
Garry says the biggest problem with this test is in its high-tech, time-consuming method.

This New Ebola Test Is As Easy As a Pregnancy Test, So Why Aren’t We Using It? |Abby Haglage |October 3, 2014 |DAILY BEAST
So, he has to deal with what will inevitably be time-consuming and complicated legal wrangling.

Peak 'Oops': Explaining the Perry Indictment |Mark McKinnon |August 17, 2014 |DAILY BEAST
Therapy is not only time-consuming, but inherently expensive.

A New Breakup Therapist: Your Phone |Erin Cunningham |July 1, 2014 |DAILY BEAST

Making real moving holography is an incredibly meticulous and time-consuming practice.

New York’s Hologram King Is Also the City’s Last Pro Holographer |Nina Strochlic |May 27, 2014 |DAILY BEAST
She tried to get interested in some time-consuming hobby, but she lacked the patience.

For Every Man A Reason |Patrick Wilkins
Just as time-consuming and perhaps more of a burden were the many administrative difficulties.

Integration of the Armed Forces, 1940-1965 |Morris J. MacGregor, Jr.
Benjamin Muse, on the other hand, considered direct, personal investigation of specific grievances too time-consuming.

Integration of the Armed Forces, 1940-1965 |Morris J. MacGregor, Jr.
Not impossible, but a highly precarious and time-consuming operation at best.

The Winds of Time |James H. Schmitz
This review was a complex and time-consuming operation, which continued into 1954.

East-West Trade Trends |Harold E. Stassen

time-consuming

taking up or involving a great deal of time