Pinhole uses a unique method to simulate the long exposure times of a pinhole camera. It does not just simulate the distortion and visual effects, it gradually exposes the scene over time like a real pinhole camera allowing effects not achievable in other “pinhole” apps or regular camera apps.Unlike a real pinhole camera, all photos are automatically exposed correctly no matter the exposure time. It can optionally simulate the vignetting and/or edge light bleed typical of pinhole cameras. Exposure time can be set to one of several presets from 15 seconds up to 2 hours, or it can controlled manually for shorter or longer exposures (up to several days, theoretically).At any point, choose an “emphasis” image that will dominate the final output--use this to freeze a moving item in the shot (this feature is experimental and the outcome varies widely based on the scene).Saves directly to your camera roll. Load images to Facebook, Twitter, Flickr, Instagram, Camera+, etc. from there.Note: the simulation is very memory-intensive, especially on long exposures. For the best stability please close other apps and disable networking to prevent incoming calls and push notifications (put it in “Airplane Mode”). Try “1/4 size” mode which cuts both the horizontal and vertical resolution in half to reduce memory usage dramatically. For best results, plug in your phone before beginning a long exposure. On the "infinity" time setting, it will run until you stop it manually, it crashes, or the algorithm used runs out of space, at which point it will automatically close the shutter. It will attempt to close the shutter prior to crashing due to running out of memory, but it's not always possible to catch this.It's not possible to give an exact upper time limit due to variations in devices and memory, but most devices should be able to handle 2 hours, at least. Newer devices should be able to go longer in general due to increased memory capacity, although they will also fill up that memory and the internal algorithm faster. Your mileage may vary -- if you're considering taking an important long-duration shot, plan ahead and run a test on the device you'll be using.