We've only seen each other once this summer and my boyfriend spent 30 days with me. I'm visiting again in February and I'm staying in the States for a month and a half. I was a little scared a month was going to be too long for a first visit, but at the end of it I wished he could stay for longer lol. I'd rather see him less often but our visits be longer than see him more often and have our visits be 1/2 weeks. The money (travel expenses are far from affordable for me) and time spent traveling (14+ hours) just feel not worth it if it's that short. I miss him a lot and I would totally try to see him more often if the distance wasn't this big, but EU to US every other month for 10 days is just not doable for me.