I can also say that in just the last few weeks, I have missed my chance to bid on an item I wanted because I had the tab open, I was watching the item, and with a few minutes left, I got distracted and didn't have a chance to bid.
For example, I had this item open yesterday, ready to bid $200 with 3 seconds left, got a phone call, and by the time I clicked back onto the tab, the bidding had ended. Big time sad.
https://www.ebay.com/itm/204074001665
as with everything in life, timing is (mostly) everything