One of the more practical shifts in how keepers manage livefood is moving away from ad hoc ordering and towards a scheduled, recurring delivery. A livefood subscription is exactly that: an agreed pattern of deliveries, weekly or fortnightly for example, set up in advance so livefood arrives on a predictable day rather than whenever an order happens to be placed.
Whichever method is used, frozen food should reach room temperature, or close to it, before being offered. Food that's still cold in the centre isn't necessarily any less safe, but many keepers find animals are more reliable feeders when the food is properly warmed through, since a cold or partially frozen item doesn't behave or smell the way it would naturally.
A reptile equipment supplier that suddenly turns its nose up at food is one of the more unsettling things a keeper can notice. It happens periodically in plenty of collections and often settles on its own, but appetite is also one of the clearest signals a reptile gives about how it's doing, so it's best treated as something to mention to a reptile-experienced vet rather than something to work out alone from a general article.
Timing the thaw against a feeding schedule takes a bit of planning, particularly for keepers feeding multiple animals on different days, but it becomes routine quickly once a pattern is established. Labelling items with the date they went into the freezer also makes it easier to use older stock first, rather than letting anything sit for longer than intended.
The starting point is working out real consumption rather than guessing. For a single animal on a simple, regular schedule, this is usually straightforward: count how many insects are used per feed and multiply by feeds per week. For a household with several animals, at different life stages and on different feeding frequencies, it's worth totting up needs animal by animal rather than ordering one large batch and assuming it will be enough, since juveniles feeding daily and adults feeding a couple of times a week have very different consumption rates.
This is a general good-practice principle rather than a precise science with fixed timings or quantities that apply to every household. How long to gut-load, and how often, depends on the insects being kept, the conditions they're kept in, and the feeding schedule of the animals they'll go to. Rather than following a single fixed rule, it helps to build gut-loading into the same routine as storing and checking livefood day to day, so it becomes a habit rather than an extra step.