The method LoadRunner uses for VUD expiration changed in 11.0x. For LR 11.04 and older versions, the expiration time was set when the license was generated.

In LoadRunner 11.5x and 12.0x , the expiration time is set by a field on the LR License Utility. In the bottom of the screen that says ''VUDs will begin at:'' and the start/expiration time is a link. IF NO VUDs ARE ACTIVE, you can click on that link and change the start/expiration time. If any VUDs are active, the time is locked until the active VUD expire: the link is still there but attempts to change the time are refused. This time will be applied to any VUDs that are started. The default setting is 6AM. When using VUDs, please set to an appropriate time for your test.

![stattime][1]

[1]: /storage/temp/193-starttime.png

No Problem,

1. Buy the 10,000 VUD users
2. Create, enhance, and debug your scripts
3. Create load test scenario
4. Enable use of VUDs
5. Enter in the number of VUDs you want to use ( note if you have permanent license subtract that number from the VUDs you need for that test ( 100 Perm Vusers + 1900 = 2000)
6. When you run the only the 1900 VUDs of the 10,000 will be used
7. The 1900 VUD will expire 24 hours from the start/expiration time set in your License utility
8. Leaving you 8100 VUD to use when you need them, be it 1 day or 100 days later

@DavidMofOSI
Dave,

If I buy a bucket of 10,000 VUDs, how do I use just a portion of them? I don't want to run 10,000 users in one test. I need to run 2000 users for 5 days...and not necessarily consecutive days.