I'm also about 50 days, so far just doing trickle and no plans in near future to change that.
Until recently when I finally got my garage cleared away I was charging using an extension cable--not a heavy duty one, either. The cable itself said it was rated at 13 A, so I wasn't exceeding it, but it did get quite warm to the touch and it would get particularly warm where it was connecting to the receptacle. When I finally detached it and got the EVSE plugging into the outlet itself I found a little brown on the outlet due to excessive heat over too long a period of time, hence why Nissan says do not use extension cables. I understand the heavy duty ones are safer, but don't use a cheap one is my recommendation