In Stars Without Number, an OSR sci-fi game that is not the ruleset I use for the show/campaign but it has useful Equipment sections and all that good stuff. It states that:
"Poor lifestyles involve barracks-like quarters,
public transport, and small and infrequent luxuries."
and
"Common lifestyles usually allow for a private urban
apartment or rural home, a rented personal vehicle, a
respectable wardrobe, and regular small indulgences."
In the past when I created the Crimson Hound I considered the rental price of his apartment using prices listed in LotFP. I then never bothered to consider things like food and public transportation. I'd stated "He rents an apartment in a bad part of town that costs 30 GP/month, 1 month is already deducted from his current GP."
Stars Without Number gives us this table for overall cost of life instead of tracking down every single expense:
So far in the Serial it's been established that The Crimson Hound has an apartment but no vehicle and uses public transportation. So in other words he's somewhere between a Poor and Common lifestyle, which we'll average at 12.5 GP/Day.
But it's also stated that: "Prices given here assume short-term rentals and
contracts, plus the inevitable premium charged to outsiders in almost any society. Natives might be able to
enjoy a given level of lifestyle for only half as much,
but such savings usually rely on a local’s connections."
The Crimson Hound rents his apartment under the name of Adamus Ward and permanently resides in it, he is therefore a 'native'. So that takes us to 6.25 GP/Day.
Unless a Serial happens to expressly last longer than one week in the story or logic dictates a different timeline, I will default on average that each Serial takes place the week following the previous Serial. (Which yes, means that the Crimson Hound has very action-packed months!)
So 7 times 6.25 GP gives us 43.75 GP. In other words, every week/Serial costs the Crimson Hound 43 GP, 7 SP, 5 CP. A bit cumbersome so let's clean t up to 43.75 times 4 for a clean 175 GP/4 weeks.
Every 4 Serials the Crimson Hound has 175 GP removed from his character sheet. If he ever happens to not have enough then he is in debt and/or in danger of being evicted.