Practice Tips - Part 1, Making Time
A wonderful aspect of playing the harmonica is that it's portable... you can literally practice anywhere.
Some technique practice, such as bending, works just fine practicing in small chunks of time throughout the day... 5 minutes at a time for example. In the case of bending, you're developing muscle memory, so it's preferred to practice in this way.
Areas of focus, such as working on a study song or improvising, requires longer practice time.
Either way, make a plan of attack of when you'll practice and be consistent about it. When life gets busy your main goal is just to get the harmonica in your mouth whenever possible so you don't backslide. Otherwise, setting a regular time in your day to practice, and placing it on your (and others') schedule is important.