Summarised in a phrase of this generation - "If you don't use it you lose it."
In terms of this situation, 10 days of intense meditation will be beneficial for setting up a foundation for sporadic use in the future. When it comes to yourself, it would have to be in line with your cultivation goals, usage and path.
Put it into the perspective of learning to ride a bike:
Takes a lot of effort at first, but once you do learn it's difficult to forget for a while. If you want to be a BMX professional it will take a lot of continued effort; if you enjoy it, continued practice becomes more of a past time; and if you want to use it for a particular agenda (in the case of vipassana, it would be application of greater insight) then conditioning your use for your purposes is the appropriate path.
Considering vipassana is a technique of introspection of one's 'cultivation'; this implies continual conditioning for the growth you are working towards (mastery of self) through means of insightful cultivation, so practice is encouraged.
When one masters a technique, are they the master of the technique? Even if we have got something out of it, is there more we can learn from or apply the technique to? Is there a higher peak of mastery we have yet to become aware of?
When we reach a point where we are not gathering more insight following one method and practice becomes stagnant, that is called a bottleneck in cultivation, like a puzzle missing a piece. When we reach a point like that, we tend to become complacent with continued practice.
To breach these bottlenecks we have yet to learn some relevant insight, when that insight is applied it results in a 'lightbulb' moment which could be considered some level of enlightenment.
Instead of using a singularly faceted approach to the technique, finding alternative methods of application encourages continued use of good time spent learning an invaluable technique.
Cultivate in harmony