Q: I am afraid to put my computer working for more than 4 hours. So after 4 hours i usually shutdown my computer and power it on only after an half hour. i had read some where that a computer can work for many hours with out rest. well some body help me deciding this - how long can i keep my computer working with out shutting down?.
A: If you are using windows, then running it continuosy would make it crash after 49. days. The reason being , the Virtual Machine Manager (here after referred as VMM) is responsible for creation, execution, monitoring and termination of virtual machines in windows. This VMM, which is a 32 bit, protected mode operating system entity, provides a number of system services at chip level. One of these services is "Get_System_Time". This particular service loads the EAX register with the time in milliseconds since Windows started on that machine. This service is accurate to 1 ms. EAX is a 32 bit register in Intel 386 Processor onwards. So the maximum number of milliseconds it can hold is (232)-1 = 4294967295 milliseconds = 4294967.295 seconds = 71582.79 minutes = 1193 hours = 49.7 days.