Welcome, @Prasanna_s_BIOLOGY
These are the tutorials we have that focus on computational chemistry, including the GROMACS tool.
→ Computational chemistry / Tutorial List
If your question was about job execution time, there was another question this morning, and the answer applies to GROMACS → Job execution timing and computational resources: any tool, any public Galaxy server
If you question is about something else, would you please explain a bit more?
Thanks!