Seco Lube 500 Clear , and Clean

Got the gallon of Seco. Flushed out dirty Royal purple with clean Royal purple then drained that real good , filled my Tuxing twin cylinder model TXED012 With the clear , and clean Seco Lube 500. Filled my .22 cal Guantlet 2 SL from 0 Psi to 4,500 Psi in 3 min , and 58 seconds.
I used a stop watch will log each fill.
How long do you guys leave it untill you change it. How many hours
OldVet wants to know..