Reload Ticks for less than 1 day

Hello every one.
To have accurate volumes figures I need to reload data.
To do so, every 15 minutes I use the following code lines :

ChartCommands.CommandLine(".rld int=1 day, res=1tick");
ChartCommands.CommandLine(".rld int=1 day, res=1min");
ChartCommands.CommandLine(".rld int=1 day, res=1day");

This update my data base correctly. But to update 1 day of Ticks history takes time. As I process every 15 minutes I would like to reload less than 1 day, probably 1 hour, even 30 minutes.
Is there a way to reload the previous 1 hour or 30 minutes (int=1 hour, int=30 minutes) while using res=1tick ?

Thank you for your contributions.
Have a nice day.

Hello everyone,

I was wondering if this could work ?

ChartCommands.CommandLine(".rld int=10000 ticks, res=1tick");

Thank you in advance for your contributions.