Estimate time to write a lab report.
A lab report is four jobs, not one. Drafting time comes from word count and writing speed, figures cost roughly twenty-five minutes each once axis labels and captions are done properly, proofreading and reference formatting add about a quarter of the drafting time, and data analysis sits on top as separate work. Costing them apart is what prevents the classic mistake of allowing only for the writing.
Drafting and figures
Writing hours = word count / words per hour; figure hours = figures and tables x 0.4
Total effort
Total = writing hours + figure hours + 0.25 x writing hours + data analysis hours
Results and discussion, because they require the analysis to be finished and the argument to be constructed. Method and introduction are largely descriptive and move much faster.
Method and introduction, yes — and doing so early is efficient. Results and discussion cannot honestly be drafted until the analysis is settled.