scale_list = ['5T', '10T', '20T', '1H']
df_group_list = []

for sc in scale_list:
    df_group = df_USU.groupby('TIME').count()
    df_group = df_group.resample(sc).sum()
    df_group['time_scale'] = sc
    df_group = df_group.iloc[1:]
    df_group_list.append(df_group)