Greetings,
the rough cost estimate would be from 8000EUR - 12000EUR, which is a calculation derived from the aprox. estimate of 200 - 300 hours for the completed project, and hourly cost of 40EUR per hour.
Regarding time span prediction would be around 20 - 30 working days, derived from the assumption that 2 developers will work constantly on the project for 6h per day. Depending of the urgency of the deadline, we can assign more or less people. But our recommendation is maximum of 3 developers in the team.
Here is the calculation:
min: 200 hours + 20% unexpected impediments / 6 hours per developer * 2 developers assigned = 20 days
max: 300 hours + 20% unexpected impediments / 6 hours per developer * 2 developers assigned = 30 days
Explained:
We calculate that the developers full time is 8 hours, where a person is able to actively work on the tasks for around 6 hours per day. Plus we add 20% (which is not added in the costs) that are unpredictable hurdles during the development process. The 20% is not charged, they are considered to be our internal issue. (hardware, software issues and similar)
I'm looking forward to hearing from you. Best regards, Albin.