Well say I have the "detect magic" spell as a level 1. It is kind of a waste of a spellslot to just use it willy nilly. However I could stand still every step and cast it as a ritual for 10 minutes.
This however seems really silly when dungeon crawling, to stop at each "point of interest" and start a ritual. If I tell my party to "just stop at each door to let me check if it's enchanted" I feel really awkward to just make the game slower.
When is an appropriate time to tell the party "Hey, I'm going to waste everyone's time just to check if there's magic in the air"?
I'm wondering especially since I joined a new playgroup, and this time a group with people I didn't know beforehand.
To clarify what the real question is: my problem is not so much with the specific of the ritual (or any cantrip) but rather the repetitive nature of such requests to the DM. (And group in total). Rituals/cantrips can be repeated ad infinitum, and thus there's no real drawback.
Except there is: I know from experience playing Magic the Gathering commander that in a new playgroup the moment I play rhystic study everyone gets slightly annoyed. Not because of the effect, but because I constantly ask them for each action they do: "Do you want to pay 1?".
I fear the same thing happens when I wish to use cantrips/rituals for exploration: someone wishes to check a door. I say "wait I prepare xyz". Someone walks down an alley I say "wait I prepare xyz.... again".
In the current group I just joined I feel really awkward. Pregame talk got them saying they "really needed someone to check for traps a bit more". But the moment I started playing the story continued with them in character ignoring all advice written as "bluff by evildoers" and easily steamrolling all traps.