I can vouch for Toning outside being a very pleasant experience
Pick a sheltered sunny spot in the garden, a stable work surface and away you go
For some reason, the time seems to slip by more quickly outside and also I am more able to judge the prints progression
I suspect it is because there are plenty of other distractions, you see the build up of tone more easily by glancing at it, than continuously staring at it in the darkroom
I use dish warmers to extend the "toning season"
Tim Rudmans book on Toning is excellent, if you want to do it seriously
Martin