most (not all, some contributions are QTVR-only due to historical reasons)
many, but depends on photographer's choice of file upload (newer event = more likely to work) and your device's capabilities. You may experience slow playback, distorted images or unexpected browser quitting if there is only limited memory/GPU power available.
My Winter Solstice Panorama shows my personal Sanctuary. The basement of my home was only concrete walls and floor with dark wood beams overhead when my wife and I began work to make it a useful, livable space. We planned and completed almost all the work ourselves. Because of this we were able to create a room where we are warm and comfortable while we enjoy games with our grandchildren or listen to music or watch television or pursue a hobby project. We installed a refrigerator, sink and microwave oven and have a bath room with shower connected. We are able to spend all day here. It took much work and time but was worth it. Now we have a place that is beautiful and secluded, summer or winter. This place is my Sanctuary.
Latitude: 38° 36' 0" N
Longitude: 76° 49' 41" W
Precision is: Low. Intentionally hazy, due to privacy concerns.
Equipment: I photograph with a Kodak DX7440 and a Kodak Ektanar wide angle lens attachment. My tripod is a small Bogan 3001. I use a Kiadan 360 panoramic head and have attached a bubble level to it. My software is Photoshop Express, Archsoft PanoramaMaker, Apple's MakeCubic and QuickTime Pro. These run on my Apple QuickSilver G4 with 10.2.8.