Quick example how to convert a Dataframe/CSV column from HH:MM:SS to minutes.

py-time-to-minutes.py

import pandas as pd
from csv import reader

df = pd.read_csv(path_to_download_default_directory + '/test.csv')

### Convert entire 'timeColumn' to timedelta type..
df['timeColumn'] = pd.to_timedelta(df['timeColumn'])
### Convert 'timeColumn' to minutes only.
df['columnAsMinutes'] = df['timeColumn'].dt.total_seconds() / 60
### Drop the old table.
df.drop('timeColumn', axis = 1, inplace = True)

df.to_csv('newData.csv', index = False)