I went from March 15th til about 10 days ago when I flew to Europe. So about 3 1/2 months. I can report that getting back on an airplane is like riding a bike. But jet lag is no easier than it was before.
Also I restarted long distance train travel on June 1st, up and down the east coast of the US. So really 2 1/2 months without travel which was a long time.