Sentence examples for challenging project from inspiring English sources

My "challenging" project, sadly, would last only two to three hours.

Long-day programmes with play and challenging project work can be conducted by trained educators during the morning, followed by less intensive activities in the afternoon.

Perhaps the most challenging project is Neptune.

It's certainly been a challenging project so far.

Q What has been your most challenging project?

Q What has been your most challenging project design-wise?

And it was a particularly challenging project too.