Aoxomoxoa (don't know what it means but it is nicely palindromic) you need to bear in mind that most of us answering questions on this forum have only the limited experience of ourselves (or our partners) and possibly the odd similarly afflicted friend. Whereas the doctors and nurses meet multiple patients each day and can give a more representative reply.
But having said that, I largely agree with Steve. Because the operation has damaged the sphincters that normally stop you leaking, anything that needs the sphincters to work hard tends to tire them out and leave you a bit leaky for the rest of the day - but at the same time you need them to be working them hard enough to be building up muscle strength. One example is a full bladder, another is doing things that involve your abdominal muscles which raise the pressure in your abdomen and tend to "squeeze" urine out. Basically, what you are trying to do is train what is left of your sphincters to do their job well enough to leave you dry - which means doing the pelvic floor squeeses but also withstanding a fullish bladder and coping with everyday abdominal muscle use like standing up from sitting (and those winter coughs).
Going out though isn't the time to train, particularly in those early weeks! By making sure you start with an empty bladder and making use of any available toilets (I became expert on which shops have toilets!) you will feel more confident and motivated to work on your continence,