How can I feasibly continue seeing my fiance while his K-1 visa is still pending?

Question Details: My fiancé and I have long been planning to move in together after about a year of living as a long-distance couple I am an American citizen and he's an Italian national residing in Germany. We have decided that a K-1 visa, allowing him to move in with me, get married and soon after file for Adjustment of Status and attain permanent residency, looks like our best option. However, official figures state that processing times for K-1s might exceed 5 or 6 months in many casesbeing separated for this long during this crucial period of our relationship is very daunting to us. Therefore, we would like to ask if it would be possible for my fianc to keep visiting me in the States while we are both waiting for the K-1 application to be finalized, and if so, how we would go about this in practical terms (e.g. what time-frames are acceptable, and which visitor visas might be applicable for this purpose)

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