Brachah on Tzitzis

If one took off his tallis, he must make a new brachah when he puts it back on, even if he was planning to put it back on immediately (שו"ע סי' ח סי"ד); some say one should not make a brachah if he was planning on putting it back on (רמ"א שם). The Biur Halachah (שם) wonders why people do not make another brachah on their tzitzis after leaving the bathhouse; he differentiates between a person staying for a long time versus a short time. The Shulchan Aruch Harav (סי' ח' כ"ג וכ"ד) writes that “a long time” is two or three hours. Accordingly, someone who stays at a beach without wearing tzitzis for more than three hours should seemingly make another brachah when he puts his tzitzis back on.