The phrase "a formidable task when" is correct and usable in written English.
It can be used to introduce a situation or condition that makes a task particularly challenging.
Example: "Completing the project on time is a formidable task when the team is short-staffed."
Alternatives: "a challenging task when" or "a daunting task when".
Even in ideal situations, georeferencing a single locality can take minutes, making georeferencing a complete collection a formidable task, especially when investing the time to visually ensure accuracy.
It's a formidable task, formidably (and entertainingly) accomplished.
To answer objections to Merrill Lynch's settlement in May with Mr Spitzer, which saw half the $100m fine going to New York state and half to the other 49 states, all fines would go to a restitution fund, overseen by a court.Getting the various regulators to agree to this will be a formidable task for the SEC, particularly when so many are enjoying the limelight.
Identifying which bacteria are critical and which are bystanders, which strains affect which behaviors, by which pathways, in whom and when, is a formidable task.
And although the G.O.P. still faces a formidable task in winning the Presidency in 2016, when high turnout will favor the Democrats, the Republican candidate Democrats fear most, Jeb Bush, has already all but entered the race.
Engaging constantly with new ideas, new thinking about education and dealing with the various inertias of change, when taken together, presents a formidable task even if the desire for change is present.
Identifying how and when we are in transference is a formidable task, yet one we would do well to explore.
A large, integrated company makes sense, in his view, when a technology is young and it is a formidable task simply to make a product or service that works.
This renders the polar H-atoms to readily depart from their standard staggered conformations when a hydrogen bond can be formed, making the emplacement of H-atoms based on local geometry a formidable task.
