Here is a guide for the Harvesting time.
Harvesting Times for Selected Species and Hybrids
Pistillate Parent Optimum Harvesting Range (Days) Mean (Days)
Cattleya labiata Group 130-180 171
Cattleya Bifoliate Group 110-150 142
Cattleya flava, cinnabarina, harpophylla 110-120 117
Cattleya xanthina, perrinii, purpurata 120-180 170
Laelia rubescens, anceps 120-150 127
Rhyncholaelia species 130-180 160
Brassavola species 120-150 125
Cattleya coccinea 75-100 96
Epidendrum species and hybrids 100-120 119
Encyclia species and hybrids 130-180 160
Broughtonia species 60-75 66
Cattleya hybrids Labiata Group (white, lavender, pink, white with colored lip) 150-180 175
Cattleya hybrids Labiata Group (yellow, orange, art shades) 130-150 141
Cattleya hybrids Labiata Group involving former species of Sophronitis 130-150 147
Cattleya hybrids Bifoliate Group 110-150 138
Oncidium species (true) 110-140 122
Trichocentrum species (including former mule-ear Oncidium species) 180-240 207
Trichocentrum species (including former rat-tail Oncidium species) 110-130 121
Psychopsis species 90-120 100
Trichocentrum microchilum, splendidum 130-170 160
Tolumnia species 65-70 65
Rodriguezia species 110-130 123
Miltonia species (true) 120-140 130
Dendrobium devonianum, lituifolium, anosmum 160-250 186
Dendrobium nobile and its hybrids 150-180 163
Dendrobium bigibbum (phalaenopsis) and its hybrids 1201-40 131
Dendrobium stratiotes, superbiens and their hybrids 150-200 162
Vanda species and hybrids 150-195 182
Ascocentrum species and hybrids 110-180 152
Ascocenda hybrids 120-190 171
Vandopsis species 160-180 165
Phalaenopsis species and hybrids 110-120 111
Rhynchostylis species and hybrids 150-250 187
Aerides species and hybrids 150-180 162
Renanthera species and hybrids 150-180 167
Maxillaria species 120-140 121
Chysis species 140-180 156
Ansellia species 120-150 130
Cyrtopodium species 150-270 182
Phaius species 120-150 135
Bulbophyllum (including Cirrhopetalum) 140-180 165
Referenced From:
https://www.aos.org/Default.aspx?id=406