Yes, there are several strategies for managing time while solving lengthy or complex commerce problems. Here are a few:

1. Prioritize tasks: Break down the problem into smaller tasks and prioritize them based on their importance and urgency. Start with the most critical tasks first and allocate time accordingly.

2. Set deadlines: Establish deadlines for completing each task and hold yourself accountable. This will help you stay focused and ensure that you are making progress within the allotted time.

3. Time blocking: Allocate specific time blocks for different tasks or sections of the problem. This will help you concentrate on one aspect at a time and prevent you from getting overwhelmed.

4. Use the Pomodoro Technique: This technique involves working in short bursts of focused activity, typically 25 minutes, followed by a short break. This can help improve productivity and prevent burnout.

5. Break it down: If a problem seems too complex or lengthy, break it down into smaller parts or sub-problems. Solve each part separately and then integrate the solutions to arrive at the final answer.

6. Eliminate distractions: Minimize distractions during your dedicated work time. Put away your phone, close unnecessary tabs on your computer, and create a quiet and organized workspace to help maintain focus.

7. Practice time management techniques: Explore different time management techniques such as the Eisenhower Matrix, the 80/20 rule, or the ABC method to organize and prioritize your tasks effectively.

8. Seek help when needed: If you find yourself stuck or spending too much time on a particular problem, don't hesitate to seek help from your teacher, classmates, or online resources. Getting a fresh perspective or additional guidance can save you time and help you move forward.

Remember, effective time management is a skill that improves with practice. Experiment with different strategies and find what works best for you.