^ Ah yes, thanks for reminding me of that bit. It’s obviously been too long between viewings of the OT for me 😛
They pretty clearly spell out that Jabba has Han and that they will be meeting at a distant point in the future at the rendezvous but to have planned it for a full year away seems a bit unplausable. All I can think and read into it myself is that it took a lot longer to get everything in place that they planned for and likely had other imminent “imperial” issues to deal with at times before they could head off to rescue a lone rebellion member (when looking at it from a Rebellion leadership position).
Here is the clip for anyone else interested in revisiting what Luke and Lando discuss before parting ways at the end of TESB: