DDWRT - Syntax for Time Parameters in QoS CRON Job

Please redirect me if I'm posting this question in the wrong place.

Background: I'm currently running DD-WRT v3.0-r29519 std (04/25/16) on my TP-Link Archer AC1750. For QoS, I have HTP scheduling set up with a very simple set of rules defined in the DD-WRT GUI at */QoS.asp.

I've searched through dozens of DD-WRT forum entries to try and understand this code, per the DD-WRT wiki page

1 17 * * * root /usr/sbin/svqos `nvram get wshaper_downlink` `nvram get wshaper_uplink` `get_wanface` `nvram get wan_mtu` 0
*/6 1-17 * * * root /usr/sbin/svqos stop 0 `get_wanface` 0 0

I would like to enable my GUI-set QoS settings from 12 PM to 5 AM, and my guess is that the code would look like this

1 00 * * * root /usr/sbin/svqos `nvram get wshaper_downlink` `nvram get wshaper_uplink` `get_wanface` `nvram get wan_mtu` 0
*/6 0-00 * * * root /usr/sbin/svqos stop 0 `get_wanface` 0 0

The cron page gives a hint about time format, but I can't seem to find any good documentation on what exactly the code above is doing, nor (more importantly) how I could change the times appropriately. Can anyone give me a hint? Bonus points for helping me translate the rest of the code, or showing me a resource that can.

I would like to avoid rewritting to NVRAM twice a day, as some solutions suggest. I want my router to last as long as I can get out of it.

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