dingo@dingo7:~$ free -m
              total        used        free      shared  buff/cache   available
Mem:          13463        1029       11445          16         988       12159
Swap:           472           0         472

<global_preferences>
   <run_on_batteries>0</run_on_batteries>
   <run_if_user_active>1</run_if_user_active>
   <run_gpu_if_user_active>1</run_gpu_if_user_active>
   <suspend_cpu_usage>0.000000</suspend_cpu_usage>
   <start_hour>0.000000</start_hour>
   <end_hour>0.000000</end_hour>
   <net_start_hour>0.000000</net_start_hour>
   <net_end_hour>0.000000</net_end_hour>
   <leave_apps_in_memory>0</leave_apps_in_memory>
   <confirm_before_connecting>0</confirm_before_connecting>
   <hangup_if_dialed>0</hangup_if_dialed>
   <dont_verify_images>0</dont_verify_images>
   <work_buf_min_days>0.020000</work_buf_min_days>
   <work_buf_additional_days>0.000000</work_buf_additional_days>
   <max_ncpus_pct>50.000000</max_ncpus_pct>
   <cpu_scheduling_period_minutes>60.000000</cpu_scheduling_period_minutes>
   <disk_interval>100.000000</disk_interval>
   <disk_max_used_gb>0.000000</disk_max_used_gb>

 <disk_min_free_gb>0.250000</disk_min_free_gb>
   <vm_max_used_pct>100.000000</vm_max_used_pct>
   <ram_max_used_busy_pct>100.000000</ram_max_used_busy_pct>
   <ram_max_used_idle_pct>100.000000</ram_max_used_idle_pct>
   <max_bytes_sec_up>0.000000</max_bytes_sec_up>
   <max_bytes_sec_down>0.000000</max_bytes_sec_down>
   <cpu_usage_limit>100.000000</cpu_usage_limit>
   <daily_xfer_limit_mb>0.000000</daily_xfer_limit_mb>
   <daily_xfer_period_days>0</daily_xfer_period_days>
</global_preferences>
                            

I tried that but no good on Windows 10 so will give it a miss for now. It works on Linux OK but no VB and the tasks run forever.

They only estimate forever on Linux. Your machines are about like mine; they will average about 6 to 8 hours.

Dingo
Have you checked/done this?
https://quchempedia.univ-angers.fr/athome/forum_thread.php?id=20