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It's better to increase the time until you get to at least 20 minutes, although 45 minutes duration is better as a foundation for altering the exercise to increased inclines, or intervals etc. So you may decide to build your time up a bit more until you can comfortable exercise at a low MHR% i.e. 60% for 45 mins before upping tempo and difficulty levels.
I tend to try to incorporate at least one longer session of an hour now, because I've read that LIIT and HIIT both give different benefits and both compliment one another, so Tuesday I actually did a 1 hour session and enjoyed it because it shows that aerobic endurance is good, certainly better than it was when I began exercising; and then Thursday and Saturday, I throw in 2 HIIT sessions which are challenging in a different manner. It also keeps the variety there, so that boredom has less chance of setting in.
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