guys regarding the default time spawn needed on one's cell,how does it work actually?

i mean,which counts as being on a different cell??if i'm in whiterun which there's a several plants i can harvest..if i went to a tavern,does it counts as being on a different cells in the game??

Interiors count as one cell each. So if you're in a dungeon, that's all one cell. However some dungeons are split into multiple cells. So for example if you find a door in a dungeon that says "Magic Dungeon Catacombs" or whatever, and going through that door pops up a loading screen, then that's a different cell.

Outside, the world is split up into cells based on a grid. Type tb on the console to see where the cell borders are. Cells are loaded into memory as the player walks around, based on the uGridsToLoad value (default 5). That means that as you wander, a radius of 5x5 cells are loaded around you. As you cross the first border of the last cell in the radius, the game will unload previous cells and re-load the 5x5 radius.

Oh, and cities are in their own wordspaces. They keep the same cell idea as outside, but the cells aren't loaded if you approach it in the wilderness. You must go through a load door. Then, within the city, 5x5 cells are loaded around you as normal, except that exterior wilderness cells aren't loaded (the opposite of what happened outside).

So, walking into a tavern and waiting however long will trigger a reaspawn to outside. However running to the bottom of Whiterun won't trigger a respawn because you've still got the cell from the top of Whiterun loaded in memory.

ooohhh i see...so if i wan't to wait for tomorrow new items on the general goods store i don't have to go past the castle gate instead i'll just wait 24 hours on the tavern right...

if the mechanism you just describe are how those cells works,then would it mean if i want to use console command "pcb" being any different outside area or inside a room??

No, in fact you can wait outside the shop and it'll still work. Cells are linked by load doors, which essentially teleport you to the new destination. Apart from those, the game doesn't associate indoor locations with exterior locations, so waiting outside will still be fine. As long as you don't visit/load the cell before the respawn timer, it will respawn, it doesn't matter where you are.

PCB doesn't unload cells per se. What happens is the cells you've previously visited get unloaded but kind of stay in memory just incase you go back to them. So for example if you enter a dungeon and then leave it, and then enter again, you'll find that the load screen is a lot shorter because the cell is still in memory. However it's still unloaded so waiting outside to respawn will work as normal. PCB simply removes these cells from memory, meaning that it clears the "cache" so to speak. This means that you'll have to load every cell as normal, however it can improve performance if done in a long play session.

so changing locations between load doors means more cells in memory,which is good but in a long session could cause performance issue...got it!!!

thanks a lot man