That’s how long my PhD was, from the day I started to the day I had my viva. 1345 days is just over three and a half years. That’s a long time! I didn’t work every day. I took holidays, I had breaks, but still a large part of those 1345 days involved going to the office and working.
And thinking about my work on the train.
And in the gym.
In the shower.
While eating my breakfast, or watching TV.
1345 days might be longer than your PhD; it could be shorter in some cases.
But no-one gets to the viva without putting the hours in. No-one finishes a good thesis without working for it.
A thousand and more days really prepares you for the hundred or so minutes you defend your thesis.