For memory test it is not the time but the number of passes is the one that matters. You should run at least eight passes with Memtest for an accurate result. Depending on the amount of RAM, time will vary. For example, 8 GB of RAM requires around 15 hours to complete eight passes. Since there are varying stop codes can be seen in the event log collected by "Minitoolbox", chances of a RAM failure is highly likely so please complete eight or more passes with "memtest86+" first before doing any other steps.
The Speccy link you posted is not working. Please follow instructions from the below link and post the web link displayed by Speccy in next reply (not the screenshot).
Also please upload the actual crash dump files for analysis.You can find the crash dump files inside C:\Windows\Minidump folder. Copy all the files located in that folder and zip them to a single file. Disable the "User Account Control" if you encounter a permission error. We need at least a minimum of three dumps to find a pattern. Attach the zipped dump with the next reply. If the file size is larger than 512KB, upload the zipped dumps to a free file hosting site and post the download link to it.
Example file hosting sites :