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The phrase "a hard time sustaining" is correct and usable in written English.
It can be used when discussing difficulties in maintaining or continuing something, such as a behavior, effort, or relationship.
Example: "She had a hard time sustaining her motivation throughout the long project."
Alternatives: "struggling to maintain" or "finding it difficult to uphold".
Exact(7)
Historically, though, Democrats have had a hard time sustaining interest in, or animus toward, the judiciary.
The prayerful melody of the fourth piece shed its songlike character; even the longest-breathed singer would have had a hard time sustaining the line at this tempo.
Things pick up a bit when her impulsive attempt at revenge on her rapist goes violently awry, but even when they're forced on the lam, she and Joseph have a hard time sustaining the plot.
Mr. Cantone gets most of the best lines, but even so, the other cast members have a hard time sustaining the energy he provides, and none have found the idiosyncrasies that would make their characters distinct.
"But we've had a hard time sustaining our energy".
Long term, if you go really low, you'll likely have a hard time sustaining that diet.
Similar(53)
Positive energy, wholesomeness and intense healing effort may sustain many a family, but they have a harder time sustaining compelling narrative.
Hopefully it's a novel, but I have the hardest time sustaining prose.
I have a hard time answering "no".
RESTLESS I have a hard time sleeping.
I have a hard time with it.
More suggestions(3)
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com