From my experience, humans can smell it for a week. Depends on the age of the tom, actually. I'm told if the tom actually sprays you it can take several washings of you and your clothes to get the smell out.
Portable black lights Amazon around $10
https://www.amazon.com/s?k=portable+black+lights&crid=2K9QIO60WNG2R&sprefix=black+lights,aps,196&ref=nb_sb_ss_ts-doa-p_6_12&tag=thecatsite
these look really easy to use, but there are others on that page.
Portable black lights Amazon around $10
https://www.amazon.com/s?k=portable+black+lights&crid=2K9QIO60WNG2R&sprefix=black+lights,aps,196&ref=nb_sb_ss_ts-doa-p_6_12&tag=thecatsite
these look really easy to use, but there are others on that page.