Yes, religiously. From late L2 until early-mid L3 I check all larvae every two weeks. Once the mid L3 (if we're talking DHH) reach 50> grams, they're moved into larger totes and then get a check every 30 days. After larvae reach 105> grams and/or begin to yellow, they're moved into even larger tubs to begin pupation. After this stage they're left alone for approximately 2 months before checking on them again. This allows larvae that are still putting on weight to continue to do so, while also giving mature larvae a larger window of time to construct pupal cells.
These "checks" give me an opportunity to weigh the larvae for my records, as well as sift the substrate through a soil sieve to remove any and all frass. I also use this time to replace any eaten FS with fresh to maintain a consistent substrate depth, and add my protein supplements (if doing so).