40 minutes - 1 hour
The space on the 256 GB SSD in my mid 2013 MacBook Air 11" was getting narrow.
I ordered on a Sunday, the package arrived on Wednesday - in Germany!! Having the right tools, the exchange was done in two minutes. Of course the data transfer from the time machine backup took significantly longer, two hours and half, but was neither a problem!
Right tools are indispensable, of course. Everything else is most easy!