I am using dataloader to update and insert 1000 records. How many times will trigger and workflow fire in overall process 

I am working on Visualforce pages where I have a scenario in which we have a Opportunity lookup as a input field. Now I have to display the selected opportunity's related opportunity products as a lookup so that we can select one of the product and show its relative details.
Can anyone please guide.

I am using dataloader to update and insert 1000 records. How many times will trigger and workflow fire in overall process