The phrase "a lengthy intervention" is correct and usable in written English.
It can be used when referring to an intervention that takes a considerable amount of time, often in contexts such as healthcare, therapy, or discussions requiring significant engagement.
Example: "The team decided to conduct a lengthy intervention to address the ongoing issues within the organization."
Alternatives: "an extended intervention" or "a protracted intervention".
If your point is widely shared in the room, you won't need to labour it; if it is not, a lengthy intervention will not win you many converts.
As with everything that occurs at Westminster these days, the debate could not be left to pass without a lengthy intervention from the SNP.
The new leader of the Christian Democratic party (CDU) has made her clearest statement yet that she is now setting policy in Germany's ruling party by penning a lengthy intervention on Emmanuel Macron's calls for major EU reforms.
20 treatment sessions represents a lengthy intervention.
Third, a lengthy intervention programme also adds to the workload of staff involved in the intervention, and may limit the amount of children that receive intervention.
15 This is an important consideration in the context of people with serious mental illness and their carers where motivation to stay in the intervention may be impacted on by a lengthy intervention phase.
The group that exhibited the least significant findings was the combined group and, as noted below, this may be due to the greater general severity of symptoms in this group and the need for a more lengthy intervention.
While 18 months is long for a pilot effort, treatment foster care is an unusual and often lengthy intervention.
But Schuman-Olivier's finding suggests that people who are not pre-disposed for mindfulness may need a more vigorous or lengthy intervention, in order to more thoroughly learn mindfulness skills.
Its economy, based essentially on exports of oil and gas and weakened as the prices of these products declined, simply could not sustain the burden of a lengthy military intervention.
His only lengthy intervention during the last turbulent week in India came in a video, recorded before his arrest at 7am in the morning by Delhi police on Tuesday and released the moment he and a thousand or so of his followers were rounded up.
