Yes you can make a ten minute short movie in five months. It is a realistic time-frame and makes the goal realistic and specific. The most important part of the process is to “Set Deadlines” for each stage of the production.
I have broken down the action steps over Five Months, needed to achieve the goal as follows.
Month One
- Perfect and finish your Script.
- Advertise your Casting. Place an Add on the correct Acting Sites
Month Two
- Have very productive Casting Sessions
- Choose your Actors.
- The Producer/Production Manager should Start Preproduction.
- This is the process of finalising your locations, your crew, your equipment and your cast.
Month Three 
- Final Preparations for the Shoot Catering and Unit.
- Director prepares his or her Shot List, Actor Blocking Plan Production Design Plan.
- He or She rehearses the Actors and finalise costumes,
- Goes to the film sets on location and finalises the plan.
- The Shoot takes place at the end of the month over 4 Days.
- Usually a Saturday Sunday if you have a day job.
Month 4
- Shoot concludes at the beginning of the month. 2nd Shooting Weekend.
- Postproduction Starts.
- Editing goes on in earnest.
- You edit the film and colour it and add titles
Month Five
- You conclude Editing
- Move to the next phase Sound Post.
- You get the dialogue tracks cleaned up and ADR (Actor Dialogue replacement)
- You find great Music and add Sound Effects and mix all of the tracks together.
- You Export a version of the film.
- You do a few test screenings.
- Then tweak the edit on the basis of trend feedback.
- Then you Export the Final Version.
- After Final Export, you enter film festivals
- You need to know the tricks of doing so and how to save money.
- You also need to know the seven Best Platforms to get your film on.
Conclusion. 
Phew It sounds like a lot. And yes it is a challenge. However, it does not have to be hard and complicated when you have great mentorship and help and coaching.
Have a look at the Five Month Filmmaking Course where you learn all of the above and get your film made in Five Months.
