forced march
Primarily a military term for a march pushed beyond normal limits, often at high speed or over long distance.
The unit headed for its destination on a forced march through the night.
pushing through on a tight schedule; intensive effort under time pressure
Figurative extension of the military sense; used for any activity carried out with relentless speed and strict deadlines, often implying strain.
To meet the deadline, the team pushed through the work on a very tight schedule.